Same issue as the OP. Wifi drops randomly throughout the day, usually 4 or 5 times, most noticeable when watching YouTube or using Microsoft Teams vs regular browsing as it reconnects almost instantly.
Happens at home and at work. I've tried switching off the power save mode like Reddit suggested via Device Manager, tried changing the Wifi bands and other trickery, nothing works.
Right now doing the Diagnostic tool. Unfortunately am out of the States and not near a Microsoft store for the next few months but still within warranty so hoping the Wifi adapter can be replaced in-store or I'll send for service in a couple months.
Love the device otherwise and it's the second Surface I've owned.