Welding Tips and Tricks

Hello looking for some help? i have a Miller Aerowave couple of days ago while welding aluminum, pressed pedal down (wireless remote) start welding in about 20 seconds just cut of lifted pedal up pressed down and welding starts again another 20 seconds or so and same thing cuts out, let the pedal up press back down welding again for another 20 or 30 seconds, never had a problem with this machine and i am a long way from any service center, i switched it from ac to electrode negative dose the same thing, i then set for welding with no foot pedal dose same so it is not foot pedal related, has experienced this with there Miller and if so what was the culprit, or anyone have a good thought on what to look for, any thoughts or help would be much appreciated
Thanks to all, Wayne.