hello, I'm Jayshri, Independent advisor I'll glad to help you here.
I understand how frustrating it must be to deal with constant Wi-Fi disconnections, especially when you rely on a stable connection for work and important calls. It sounds like you've already tried several troubleshooting steps without success, so let's explore a few more potential solutions to help you get back on track.
Open Device Manager > Network adapters > right-click your Mediatek Wi-Fi card > Properties > Power Management tab.
Uncheck Allow the computer to turn off this device to save power > OK.
In Device Manager, right-click your Wi-Fi adapter > Properties > Driver tab.
Click Update Driver (or Roll Back Driver if the issue started recently).
Log into your router’s settings and change the Wi-Fi channel to a less crowded one (e.g., channel 1, 6, or 11).
In Device Manager, go to your Wi-Fi adapter > Properties > Advanced tab.
Look for 802.11ax and set it to Disabled.
Go to Settings > Network & internet > Advanced network settings > Network reset.
Try these steps, and see if the issue improves!