yep, that is one of the issues with this switch assembly, during full auto the vibration causes those contacts to loose contact with the selector plate.
this problem isnt there with my VFC 416 since the switch assembly doesnt have those contact points.
i have a G&G UMP and a TM G36, both of them have studdering issues. also these V2 gearboxes have quite the long trigger pull, so im modifying mine and removing the copper plate contacts with a Tact Switch
this should reduce the trigger pull distance and also make it so you get some tension on the trigger just befor it clicks.
i got this done for my HK416 already and it's much nicer. you can feel the switch just befor it clicks.