Has anyone ran into a problem with these Chinese made welders where your shop lights quit working when in the TIG mode? I have a Simadre CT520 that shuts a few of the lights off in the shop when you depress the torch switch. It only happens when the machine is in the TIG mode. The plasma and stick mode does not have issues. The TIG side still works well even when the lights go out. I sent an email to Simadre and haven't had much luck out of them responding. I also checked all input line voltage and amps to the welder and it is all fine. I assume that it is the HF interferring with the lights. Any suggestions?