We have 1997 Mitsubishi FX20 wire machine which we inherited about a year ago. It worked fine for a while but since about 5-6 months it started to show a contact with the IP settings of 4 and up. It works fine with smaller power settings. Initially that was happening only once in a while, now it seems to be working correctly only once in a while. I checked pretty much everything for any broken wires, so that is out of question. Beside that it would show the contact constantly not just on higher power settings. Did anybody experience something like that? Any suggestions what could be wrong?

Thanks,
Pete