I turned off the flap and shutter on my tig and I can’t get the unit to power back on. I’ve tried 3 sets of fresh batteries. I talked to a buddy of mine and he just tested this on his unit and he couldn’t get his to power back on either. After holding the #4 button for 60 seconds it powered up but he tried to repeat the process and it wouldn’t do it again. Has anyone experienced this issue?