Hi Stolen97
welcome to the Apple (user-to-user) Community.
Re: Wifi Instability Issue: BigSur 11.7.9
Troubleshooting :
Apple support has some tips about connecting (and using diagnostic tools) that you may want to try:
What to do: If your Mac isn't connecting to the internet over Wi-Fi - Apple Support
Eg: Make sure that the date and time are set correctly on your Mac.
Also: Learn about network issues related to VPN and other software.
Try turning off any third-party (non-Apple) software, (and / or check for updates for necessary software):
(unnecessary add-blockers, virus-checkers or the like, even VPN can cause interference).
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If needed: you might want to check with your ISP about interruptions to supply / service / and to make sure everything is working properly.
Also:
How to: Resolve Wi-Fi and Bluetooth issues caused by wireless interference - Apple Support
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More info. / support / contact:
MacBook Pro Support:
MacBook Pro - Official Apple Support
All the best :-)