Note I said try disabling the docker service - not just the container to make sure. Do you lave other containers running - this is not something that can be seen from the diagnostics. Also it is possible that the docker service itself is doing something periodically even when idle.
Yes. That was what made me immediately suggest docker (and containers) as the possible causes of the disk activity.
BTW: I have no experience of that container so have no idea why you are getting that message logged. It makes me think something may not be set up ideally.