Walther SSP-E Charging Trigger noice

Walther SSP-E Charging Trigger noice

Every time I charge the battery and not completely push in the contact 100%—it always makes some noise in the trigger.
The behaviour of the trigger is weird, it sounds like an automated pistol.

It feels like there is a shortcut in the trigger house vs trigger chassis. Bad connection or something. Anyone, who has the same problem?