Sorry, I don't know what you're talking about, I've had 18 docker services running for a long time on LE 9.2.6-x86_64 as a 24/7 server, and I never (*) had the problem you describe. Check your containers.
(*) Only once, I installed a container that was abusing disk storage space that was not freed up, but it was a very old container that I replaced with a newer one. The problem was immediately fixed by the cleanup and removal mechanism of the LE 'docker' addon. To see this I look at the size of the automatic backups that run every three days. I also occasionally use the 'cputemp', 'gputemp' and 'sensors' commands to check that the temperature stays below 45 degrees.