No ideas?

I have tested some more and the problem seems to be not with Domoticz.
When Domoticz is not running (Pi with Domoticz shutdown) I get the same behaviour!
Also other switches have the same behaviour...

Since several days I am trying to find why this happens, but cannot find the cause. Maybe someone here can help me in the right direction. Since several days I have troubles with my Aeotec ZW100 MultiSensor 6+. When motion is detected all switches in the network are somehow activated. I checked the ...