Hi Marco,
I'm currently experiencing the same problem. I was averaging 2-4MB/s, but since Friday my consensus weight dropped to 20.
It's currently averaging ~90-150+ connections, ~80% inbound, 15% exit, 5% outbound.
Arm reports my average speed as 204Kb/s, with the occasional jump 2-4MB/s, but is reporting the measured bandwidth at 160b/s.
I also have not made any changes, other than rebooting the server over the weekend to see if that would help, which it didn't.
(Full disclosure, after noticing the drop, I installed arm, and had to edit torrc to include "DisableDebuggerAttachment 0", so I did make a change... but again, it was after the drop.)
https://atlas.torproject.org/#details/AA5A35A63D38727C0CA6939691E14E675E7C41...
Is this a bwauth issue?
Kind regards,
Matt Speak Freely