in class we have a dimension 302 power source with a 22a 24v wire feed on it today i went to use it and yet again some little a$$hole messed with it flicked all the switches around well i put it back to its set up and the digital volt meter was bouncing all over from -'s to 30's (volts) and i had it set just about 25.0v (where it normally is at 25) and it just wouldnt stop bouncing then out of no where it worked fine for a min then started again it welded fine for me then another kid got on it n it was messing up (but the only other kid who has a brain) so im highly inclined that it was the machine. any ideas.....he didnt go into details but it was something in the sort of arc stopping randomly