WI-FI stops working after a while after turning on the power...

WI-FI is not working after a while after turning on the power.

WI-FI suddenly turns off a few minutes after turning on.

The switch on the WI-FI settings screen is not grayed out, but when I try to turn it on, it instantly turns off and the wi-fi stops working.

When I reboot, it becomes usable again, but after a while, the same symptoms appear again.

What could be the cause?

Bluetooth and cellular connections work fine.

I followed Ifixit's guide and replaced the Wi-Fi antenna, but it doesn't seem to help.

Reinstalling IOS from recovery mode did not change it.