Alright...if its electronic check the sear screw. It rests on the noid...that's only if it won't decock. If it won't recock...take it out and check the bolt oring and give everything a thorough oiling and everything should be fine.
that your tank valve pin is hitting the asa and opening up all the way.
if the pin is not or your tank has an issue and is starving your marker for air it do what you posted about. when you first screw on any tank you hear any maker fill up with a woosh...that first fill is good for 2-3 shots.
if you have a reg try turning it up. if you dont try another tank if it still happens see if a local pb store has a spare asa they you can dry fire and see if it the asa or the grip frame.
Does an ursine quadruped void wastes in an arboreal environment?