That “T3 time-out” error happens to almost everyone almost all the time.
My logs are full of them and my internet’s working fine. So that’s not a cause of your issue.
I was losing internet for 30-60 minutes quite regularly a week or two ago but those outages seem to have stopped. They also took out my neighbour’s internet, and on the German section of this forum others were also reporting temporary outages. Not heard of any recently though.