What causes constant disconnects and reconnects

Internet that drops and reconnects usually points to one of three places: your modem, your router, or your internet service provider's equipment or network. The pattern matters — if it happens at the same time each day, your ISP is likely doing maintenance or hitting congestion. If it happens randomly, the problem is usually in your home network or a failing modem.

The most common culprit is a modem that is overheating or failing. Modems have a lifespan of five to seven years, and when they age, they drop the connection to your ISP's network and have to reconnect. A router that is too far from your modem, or one that is overheating in a closet or cabinet, can also cause the same symptom — your devices lose connection to the router and have to find it again.

Less often, the problem lives in your ISP's network. If your modem shows a stable connection to the ISP but your devices keep losing the internet, the issue is your router or WiFi. If both your modem and router show they are connected but the internet stops working, your ISP's line or equipment is the problem.

Key Takeaways

  • Restart your modem by unplugging it for 30 seconds, then your router, and wait three minutes for both to fully boot before testing.
  • Check whether your modem's lights show a stable connection to your ISP — if they flicker or go out when the internet drops, the modem is the problem.
  • Move your router away from walls, metal objects, and other electronics, and keep it in an open space at least three feet off the ground.
  • If the problem persists after a restart, contact your ISP to check the line and modem they provided, since they own and support that equipment.
  • Modems older than five years often fail intermittently and may need replacement, which your ISP can do or you can purchase yourself.

How to restart your modem and router correctly

A restart clears temporary errors that cause disconnects. Unplug your modem from power, wait 30 seconds, and plug it back in. Wait for all the lights to stop blinking and settle into a steady pattern — this usually takes two to three minutes. Then unplug your router, wait 30 seconds, and plug it back in. Wait another two to three minutes for it to fully boot.

The wait time matters because a quick restart does not clear the modem's memory. If you plug it back in after five seconds, it often reconnects to the same error state. The 30-second wait forces a complete shutdown. After both devices are fully booted, test your connection by opening a web browser or streaming video for at least five minutes to see if the problem returns.

If the disconnects stop after a restart, the problem was a temporary glitch. If they return within a few hours or days, move to the next step. If they return immediately, the restart did not fix the underlying issue.

Check your modem's connection to your ISP

Your modem has lights on the front that show whether it is connected to your ISP's network. Look for a light labeled "Internet," "Online," "WAN," or "Link" — the exact label depends on your modem brand. When that light is solid green or blue, your modem is connected. When it blinks, your modem is trying to connect. When it is off or red, your modem has lost the connection.

Watch this light while your internet drops. If the light goes out or turns red at the same moment your internet stops working, your modem is losing its connection to the ISP. This points to a problem with the modem itself, the cable running from the wall to the modem, or your ISP's network. If the light stays solid and green while your internet drops, your router or WiFi is the problem, not the modem.

Check the cable that runs from the wall outlet to your modem. Make sure it is hand-tight at both ends — do not force it, but make sure it is snug. A loose cable can cause intermittent disconnects. If the cable is tight and the modem light still goes out when you lose internet, the modem is likely failing and needs replacement.

Move your router to a better location

A router placed in a closet, cabinet, or corner of a room will overheat and drop connections. Move it to an open space at least three feet away from walls, metal objects like filing cabinets, and other electronics like microwaves or cordless phones. The ideal location is a central spot in your home, elevated off the ground — on a shelf or desk rather than on the floor.

WiFi travels in straight lines and bounces off hard surfaces. A router in the middle of a room on a shelf reaches more devices with a stronger signal than one hidden away. If your home is large or has thick walls, you may need a second router or a WiFi extender, but start by moving the one you have to an open location and testing for a week.

Check that your router is not sitting on top of other electronics or in direct sunlight. Heat buildup causes routers to throttle their performance or drop connections. If your router feels hot to the touch, it is overheating — move it to a cooler location or add a small fan nearby to improve airflow.

Update your router and modem firmware

Firmware is the software that runs your modem and router. Outdated firmware can cause disconnects, and manufacturers release updates to fix known problems. Check your router's settings by opening a web browser and typing 192.168.1.1 or 192.168.0.1 into the address bar, then logging in with the username and password on the back of your router.

Look for a section labeled "System," "Administration," "Settings," or "Firmware Update." If an update is available, download and install it. The router will restart during the update, which takes two to five minutes. Do not unplug the router during this time.

For your modem, log in the same way using the IP address on the back of the modem. Most modems provided by your ISP do not allow you to update firmware yourself — your ISP pushes updates automatically. If you own your own modem, check the manufacturer's website for the latest firmware and follow their instructions to update it.

When to contact your ISP

Contact your ISP if your modem's connection light goes out when the internet drops, if the problem started suddenly after working fine for months, or if restarting both devices does not stop the disconnects. Tell them the modem light behavior you observed and when the problem started. They can check the line from the street to your home and run diagnostics on the modem remotely.

Your ISP may ask you to restart the modem while they watch the connection on their end, or they may send a technician to test the line. If the modem is more than five years old, they may offer to replace it at no cost. If you own your own modem, they can still check the line and tell you whether the problem is on their side or yours.

Before you call, write down when the disconnects happen, how long they last, and whether they happen on all devices or just one. This information helps the ISP narrow down the problem faster. If the disconnects only happen on one device, the problem is that device's WiFi card or settings, not your network.

Replace your modem if it is old

Modems typically last five to seven years. If yours is older than that and you are seeing frequent disconnects, replacement is often the fastest fix. You can rent a modem from your ISP for a monthly fee, usually between five and fifteen dollars, or you can buy your own modem outright for one hundred to two hundred dollars.

If you rent from your ISP, they handle replacement and support. If you buy your own, make sure it is compatible with your ISP — your ISP's website lists approved modems, or you can call and ask. Most modern modems work with most ISPs, but some ISPs use proprietary technology that requires their modem.

Buying your own modem saves money over time if you plan to keep your internet service for more than a year or two. Renting is simpler if you move frequently or want the ISP to handle replacement when it fails.

Frequently Asked Questions

Can WiFi interference from neighbors cause disconnects?

Yes, if many networks are broadcasting on the same channel in your area, your router may struggle to maintain a connection. Log into your router settings and change the WiFi channel to one that is less crowded. Use a WiFi analyzer app on your phone to see which channels nearby networks are using, then pick one that is empty or has fewer networks.

Does the number of devices connected affect disconnects?

Too many devices can slow your network, but they rarely cause complete disconnects unless your router is very old or failing. If you have more than 20 devices, a newer router designed for many connections may help. Start by disconnecting devices you are not using and see if the problem improves.

What if the problem only happens at night?

Nighttime disconnects often mean your ISP is doing maintenance or hitting peak congestion in your area. Contact your ISP and ask if they have scheduled maintenance windows. If the problem happens every night at the same time, it is almost certainly ISP-side, and they may be able to shift your service to a less congested line.

Should I replace my router if restarting does not fix it?

Not immediately. First, confirm the modem light stays solid when the internet drops — if it does, the router is the problem. If the modem light goes out, the modem is the problem and replacing the router will not help. Routers last five to ten years, so if yours is newer than that and the modem is stable, try moving it to a better location and updating its firmware before replacing it.

Can a power surge damage my modem or router?

Yes, and a damaged modem or router will often disconnect repeatedly. If your internet started dropping after a storm or power outage, your equipment may have been damaged. Plug your modem and router into a surge protector and restart them. If the problem persists, contact your ISP to check the modem, or replace your router if you own it.