I have had the hfc m190 full/semi auto pistol for about a year now. Just currently every time I put a new mag in and pull the trigger for the first time the gun shoots full auto (even if it is on semi-auto), not just until the bb's have run out, but until there is no gas left in the mag. I have two mags and it happens with both of them. Hopefully the fix is easy/inexpensive. Any advice would be appreciated.