Restart of HA leads to communication errors in HomeMatic CCU (not HM-IP)

Since some days I face heavy problems with my HomeMatic installation.
I currently I try to configure HomeKit and I am still in building up my HA installation.
So I do have allot of restarts of HA.
Until about a week ago that lead to no issues, but since then I have problems:
In my CCU I get 10 to 15 communication errors “Gerätekommunikation gestört” that persist for quite a long time and only sometime go away by using the actor.
It is somehow related to the restarts of HA.
I have 0.115.6 on Docker on a Synology DS918+. CCU ist running in VMM also on the DS (Raspberrymatic)
A complete system restart did not help.
I have no more idea what to do