I am having very similar issues. Mine happened when I changed VPN providers, but then once I set the DEBUG variable to true, the issues went away for about a day, but then came back.
I don't think it is a connection issue since I'm using Ethernet.
supervisord.log
EDIT: I've noticed that with htop my RAM usage increases every 30 seconds by about 500MB every time it restarts rtorrent, but I still have like 6GB of RAM available. After stopping the container, everything is completely fine. For a little while the rtorrent process didn't crash, and I was able to load rutorrent, but then all of my torrents had the red button to the left and when I tried to force recheck one, rtorrent crashed again, and then it started the whole crashing/relaunching loop again.