I have a 25 Crown. I have put around four tins of pellets through it. Now the regulator is changing it hold. On a fresh charge of 240 the regulator will show just under 140 for a few shots then it will drop down. It can drop to as low as 128 then could be at 137 for the next shot. Needless to say it is driving me nuts as the poi changes a lot. Any suggestions?