I give up! ONLY at night when I attempt to turn on the air vent in the bathroom it works the first time, while I shower the vent closes. I opened it to start using the manual open only control not the temp control. I try to use the vent and no matter which button I push it will not respond. The vent will open if I turn the knob for manual opening and when I start doing that, it opens and remains open. Following day, all controls work until evening when it all starts again. Anyone have a solution?