Supervisor stops responding, only full restart helps

Since about half year ago, I am getting problems with supervisor. Sometimes it stops responding and some other add-ons too, like Grafana. I cannot enter settings of add-ons and I get error that supervisor cannot be reloaded. When I use ha supervisor commands in terminal, everything seems to be good, the supervisor can be repaired, restarted, nothing in logs… Only full restart of core helps.

There seems to be problem with connection between supervisor and core. Can it be repaired without restarting whole HA?

Thanks