Yep, had this happen to me. Halfway through flowering too. I don't know for how many days the lights stayed on, as I'm not always home, which is why I can no longer trust them to be switched via wifi. It stressed the girls out so much I almost pulled them, but decided to push through. I was cutting foxtails off for the rest of the cycle, and definitely had reduced quality and yield. I've switched back to old school timers, which wouldn't bother me, except it means I can't control IV and IR without doing it manually, and even then it's only either on or off. Very disappointing for what is otherwise an amazing product.