Newish miller suitcase mig. Trigger was sticking on. Driving me nuts. Replaced switch. No fix. Finally noticed the "hold" button next to the purge button . It was on. In my defense, on the old suitcase the hold switch was on the inside. Never used it.
It's be awhile since I've seen you post. I things have been going well for you.
Been there done that. OOPs.
Putting the gun down and not realizing you put it on the switch does the same thing. Saw that happen when a guy went for a coffee break. Came back and the half the spool of wire was gone.