Wi-Fi drops when the microwave is on: what to check

Your Wi-Fi works normally, then a video pauses or a call drops as soon as someone starts the microwave. The timing may point to interference, but it can also be a weak connection, a router problem, or an unrelated internet outage.

Compare the connection before and during normal microwave use. The Connection Stability test tracks response time, jitter, lost requests, and dropouts over a few minutes. A second test can help you work out whether the problem is limited to Wi-Fi or affects your internet connection more broadly.

Check the connection while the microwave runs

1. Open Connection Stability on a device connected to the Wi-Fi you want to check. Run the test with the microwave off, and note whether response time, jitter, or lost requests are already high.
2. Repeat the test at the same spot while the microwave is heating normally. Keep other conditions as similar as possible, and try the comparison more than once. Do not place your device on or beside the microwave.
3. Open Wi-Fi Signal and check the connection quality in the same location. Its readings show how the connection behaves, not the radio signal strength in dBm.
4. If you can, repeat the comparison on another device, then test a device connected to the router with Ethernet. A wired device gives you a useful comparison because it does not use Wi-Fi.

Microwave ovens operate near the 2.4 GHz radio band used by many Wi-Fi networks. A microwave can interfere with nearby 2.4 GHz Wi-Fi, but the test can show a pattern, not prove the cause by itself.

What the result means

Wi-Fi gets worse only while the microwave is running

If several wireless devices show more lost requests or jitter during the same microwave cycle, interference is plausible, especially if those devices use 2.4 GHz Wi-Fi. This is a stronger clue if the problem stops when the microwave turns off. Try moving the router or connecting to a 5 GHz or 6 GHz network.

Wi-Fi and Ethernet both drop

If a wired device loses its connection at the same time, the cause is less likely to be radio interference alone. Check whether the router is restarting, whether its power light changes, and whether your internet service is also dropping. If the router reboots when the microwave starts, investigate power or router problems as well as Wi-Fi.

Only one device has trouble

The device may have a weaker Wi-Fi adapter, be farther from the router, or be using a different Wi-Fi band. Compare it with another device in the same place, and check which network band each one uses before changing router settings.

The connection is unstable even with the microwave off

The microwave may not be the main issue. High jitter or lost requests when the appliance is off can point to weak Wi-Fi, a busy network, router trouble, or a problem farther along the internet connection. The stability test measures requests to a server, so it cannot identify exactly where a loss occurs.

How to fix it

1. Move the router farther from the microwave. Put it in an open spot, not inside a cabinet or directly beside large appliances, metal surfaces, or thick walls. If possible, move it several feet away and repeat the comparison.
2. Try a 5 GHz or 6 GHz Wi-Fi network. These bands are farther from the microwave's operating frequency, though their signal may not reach as far through walls. On Windows 11, open Settings › Network & internet › Wi-Fi and choose the other network if your router lists one. On a Mac, open System Settings › Wi-Fi. On an iPhone, open Settings › Wi-Fi. On Android, open Settings › Network & internet › Internet, though the names can vary by phone.
3. Reduce congestion on 2.4 GHz. If you manage the router, check its wireless settings for the 2.4 GHz channel. Letting the router choose automatically is a reasonable first try. If it offers manual channels, channels 1, 6, or 11 are common non-overlapping choices in the US. Change one setting at a time, then retest.
4. Check whether the router is losing power. Watch its lights while the microwave starts. If they go out or the router restarts, the problem may involve the router or its power supply rather than Wi-Fi interference. Avoid overloading an outlet or using a damaged power cord. Ask an electrician if you suspect a household wiring problem.
5. Update the router and device software. Install router firmware updates using the router maker's instructions. In Windows 11, check Settings › Windows Update and the computer maker's driver updates. On a Mac, check System Settings › General › Software Update.
6. Stop using a damaged microwave. If its door, hinge, or latch is damaged, or the door does not close properly, stop using it and arrange qualified service. Do not open the appliance or try to measure microwave leakage with a Wi-Fi test.

Why the band matters

Many routers combine 2.4 GHz and 5 GHz under one network name and move devices between them automatically. That can make it hard to tell which band a device is using. If your router offers separate network names, connect a test device to each band in turn and repeat the same comparison.

A better result on 5 GHz supports the idea that the issue affects 2.4 GHz, but does not prove that the microwave is responsible. The browser cannot read Wi-Fi signal strength in dBm. It measures changes in the connection, such as response time, jitter, and lost requests, which can also be affected by router load or internet service problems.