I bought a Millermatic 212 a few months ago for my garage. It gets used for projects but not everyday. It is stored inside a climate controlled area with my other tools

The wire feed keeps doing crazy things. I was using the Auto speed feature but when my son was welding it kept freaking out, stopping and clicking until you turned it off. Now on the manual speed setting I will stop welding and it will just keep spooling out wire. It does this regularly but not always. One time it just spewed out gas and no wire till I turned it off and one time it quit doing anything at all until I turned off the machine. I checked the connections where the gun is plugged into the machine and they seem ok.

What the heck is going on with this thing? I bought this thing to replace my old Century 250 machine and it has not been pleasant so far....