I have the same problem. I have very fast optic fiber connection, so it's not the problem. I did an NVRAM restart (cmd+opt+P+R) - and it solved the issue but for how long?
Mac mini (late 2014) 16 gigs memory. Big Sur 11.3
Samourais
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
From
Canada