Good morning.
Since two weeks I have about the same problem. It is especially noticable while live streaming.
Internet works stable for a while and then just drops for like 20-90 seconds and then stabilizes again for a while until it happens again. Not enough, to disconnect in most of the cases, but enough to freeze the videofeed
in idle my router light ring is dim, when it happens, the box also lights up and blinks.
The Box is in Router mode.
best regards