Hi Hefe, and welcome to Vaping Underground! I hope you enjoy your stay here and kick up your feet and hang out awhile...I get lost here every time I come by for hours...this place is full of friendly people that are more than happy to try and help you where they can.
I have a question for you...was your mod plugged in when that happened? I can't remember but I think the Istick has a stealth mode, wait, lemme look it up to make sure sense I don't have one right in front of me at the moment.....I don't think it does from looking at the manual but I know the battery indicator stays on while it's charging after the screen dims...is it doing this when not plugged in and charging?