I'll report it to AVM too. The more reports they have the better. The attenuation change in my case (37 down to 24) makes me think it could be a firmware issue. I thought attenuation was the one thing that doesn't change (as it's based on distance to the cab) though I may be wrong.
Mine does start at 4am, (as on 3, 5 and 6 March), but also at other times, like the middle of the day too, most notably on the 8th from 10pm (when it wasn't cured by the reconnection the following day at 3am) and then continuous high latency until the 17th at around 5am (reconnection) following significant packet loss throughout the previous day.
I'll be interested to see whether your roll-back cures it. But if it's a firmware incompatibility I'd expect to see a number of other reports emerging as we did with the 7390s uploads. I think Plusnet have a number of Fritz! users, so it ought to show up on their forum..
The annoying thing for me is the on-going stepped throughput reductions, if they continue.
We see things not as they are, but as we are . - Anais Nin
Edited by smurf46 (Sun 19-Mar-17 21:38:36)