This morning at the end of my imaging session I parked the mount at Park1 position as usual but the mount was slewing at the opposite direction (Park4 or Park5). I stopped the slew and re-initiate the Park1 process and the mount went back to the Park1 position as it should. By chance my system is not completely automated else it can be a serious problem. At that time, the ASCOM driver was disconnected.
I will sent you the logs on request.