iPhone 12 Pro max - USB tethering stopping after a while

Hi,

I just can't figure out where the problem is. When sharing data on my PC with USB hotspot, it's working nicely for a random period of time (from only a minute to sometimes an hour), and then it just stops. The shared connection is still on and the iPhone still has the blue icon on the top left, but the gateway isn't reachable anymore on the computer. I've tried with my dad's iPhone 11 (iOS 14.4, same as me) and it's working perfectly. I've tried with my iPhone on another PC and it's also working. So I don't know whether the issue is on my iPhone or my computer.

I've already reset the network settings on the iPhone, updated all my drivers and reinstalled iTunes on the PC but nothing has changed..

Thank you for taking the time to help me.