Hello, my first post.
I'm using a pi with qBittorrent as an always on server. It started working very well, but after some time it become erratic. Downloads would start at high speed for a few seconds, then speed would slowly decrease to almost zero, then high speed again, decrease, and so on.
Looking at CPU activity, it would fall to almost zero during the low speed period, then would go up for a brief period of time in sync with speed. To me it looked like a cache flush problem.
The solution was in options, advanced, to disable "Enable OS cache"
I think this should be the default version for the armhf version.
Rgds,
Jorge