I have a similar problem very recently, it started tonight I kept getting timed out for inactivity in all game 1 minute after playing and after that my internet connection is dead as long as the game is open, the moment I close the game my internet come back up instantly
I think it's the anticheat software causing the issue. Somehow the internet router / modem panics when it sees the packet and shuts down.
I reinstalled it for BF6 here and it seems to work:
https://help.ea.com/en/articles/platforms/pc-ea-anticheat/
EDIT: it worked temporarily before crashing again.
it seemed to work for a small time (like 10 minutes) but then it happened again, Im completely lost and in despair honestly ive been trying to fix that problem for more than 2 hours now to no avail
