I have a lot of problems with stability using the linuxserver/transmission docker image in my *arr stack. I setup restarting on unhealthy status in docker compose (using the following test command curl --fail http://localhost:9091 || exit 1) but even then, sometimes I just find that my donwloads have stopped and find that the container is not running at all. Do you have an alternative to suggest, which could run in docker compose?
Had trouble with io access thru a nas when the arr move/hardmink the files. Faster disk with a raid5 did the trick. Now it freeze but far less longer. Depend on you configuration I guess