Hi folks new on here so hope you can help.I was using my migatronic mxe 180 automig today and it suddenly became possessed and started feeding wire continuously even when I put the gun down.the only way to stop it is to switch it off it has done this before and was rectified by spraying the control board with switch cleaner but not this time.it even runs with the gun taken off so must be internal I'm an experienced welder but a lousy electrician so has anyone come across this before or have any ideas I love my welder and had it years so would like to keep the machine as its like a third hand hoping someone can help cheats alan