My Hampton Bay ceiling fan remote stops working after the power (light or fan) has been on for an hour or so. When I first turn the light or fan on, everything (light on/off, dimmer, all fan speeds) on the remote works just as it should. Fifteen or 20 minutes later, I can still do everything with the remote. Go back half an hour later, and it's totally dead. It doesn't have anything to do with the remote itself, I bought a replacement remote, set the switches properly, and it has the same issue as the old one. None of the troubleshooting tips I have read seem to apply to this issue. Anyone know what the problem could be?