As with any dev preview there are a few bugs in 8.1. I'm just wondering if the Nokia Software Recovery Tool would bring your phone back to WP8? Seems like it would since its reloading the factory ROM. Anyway, wanted to put it out there as an option for anyone that is running into some bug they don't want to deal with...like the power drain issue. The only part I wonder about is if a WP8.1 backup can be restored to a WP8 device. Flashing the ROM will completely wipe the device of all data, so use with caution.