Maybe it just needs some anti spatter, but my i can see my shroud arc and then stick to the work and i have too pull it off, not all the time but then that may be as i try to avoid contact, 2 year old mig 180
The shroud is somehow connected electrically to the tip holder/diffuser, it's the only way it can become live.
It's probably just got some spatter bridging the insulation, a new shroud will sort it.