Is this a common occurrence with the Wolf then???? A lad at the range I use has this issue and has asked me to service his rifle.But I advised him to go to Daystate as I had heard they fit the newer circuit boards.Thing is his only acts up when the pressure is down a bit,not when the the tank has just been refilledI put this down to the regulator but not too sure that it is not the circuit board or a dodgy setting.