I recently moved and switched internet providers. My custom-built Windows 11 PC connected normally to the new modem/router for a few days, but now it can see the Wi‑Fi network and briefly connects before losing internet access again. Occasionally it works for a few minutes, but the connection is otherwise unstable. Other devices on the same network work without problems.
I've already forgotten and recreated the connection, restarted the PC repeatedly, performed a full network reset, renewed the IP address, flushed the network cache, reset and uninstalled the adapter, and tried registry changes from a Windows support guide. I'd rather avoid reinstalling Windows. The wireless adapter is a MediaTek Wi‑Fi 6 MT7921, so I'm wondering whether this is a driver issue, a hardware problem, or a compatibility problem with the new router. Any suggestions for getting a stable connection would be appreciated because I need it for upcoming classes.
2 Answers
The provider-supplied modem/router may be part of the problem. Some combinations of that gateway and the MT7921 behave badly even when phones and other computers work fine. If possible, test the PC close to the router with the antennas attached, or temporarily connect it by Ethernet. You could also try using your own router instead of the provider’s gateway. Moving closer may help if the signal is weak, but since another device works nearby, router-to-adapter compatibility is still a strong possibility.
The MT7921 has a history of unstable connections, especially with certain router firmware and Wi‑Fi 6 settings. First, make sure both external antennas are firmly attached and positioned properly. Also try installing the newest wireless driver from your motherboard or PC manufacturer rather than relying on Windows Update. As a compatibility test, set the router’s wireless mode to 802.11n temporarily, disabling newer ac/ax modes. If the connection becomes stable, the issue is probably between this adapter and the router’s newer Wi‑Fi settings.
I tried changing the wireless mode and checked the antenna connections, along with several other suggestions, but the connection is still dropping. I’m going to look for a manufacturer driver next.
It’s a combined modem/router located a few rooms away, and I’m not using a wireless extender. I was wondering whether distance alone could explain it, but the fact that my roommate’s device works right next to the router made me suspect the PC or adapter instead.