I use the deluge daemon to download torrents and control it by the web ui.
The download speeds are nearly always around zero, but sometimes (~ 1 / minute) the speeds go up (download to ~ 800 KiB/S, upload to ~ 3 KiB/S). After ~ 10 seconds, the speed goes down again, until it hits zero. A file which should be seeding does not seed at all. I also think these problems started popping up recently and it worked nicely before.
Port forwarding is enabled and working, the bandwidth settings should be alright:
Maximum Connections: 200 Maximum Upload Slots: -1 Maximum Download Speed (KiB/s): 800 Maximum Upload Speed (KiB/s):100 Maximum Half-Open Connections:30 Maximum Connection Attempts per Second:40 Ignore limits on local network - check Rate limit IP overhead - check Per torrent settings Maximum Connections: 200 Maximum Upload Slots: -1 Maximum Download Speed (KiB/s): 1000
Ram as well as CPU are about 20% used, Journalctl does not output anything suspicious.
I thought that maybe I'm not seeding, and therefore other seeds & peers block me, but I didn't find any settings which might be wrong.