I've kept the tablet out of the case for a few days now, and battery is functioning as it should. Only loses a couple of percent when left for 9 or 10 hours while I'm at work. Also, the tablet is kept at home when the in-case problem has occurred, and there is always a strong WiFi signal. Plus I have the 'WiFi on during sleep' mode set to 'never'. This creates a double whammy on the battery because when the case keeps the screen awake, it therefore prevents it from sleeping and so keeps the WiFi on as well.   The case itself is probably an unusual one. The magnet in the case isn't designed to trip the auto wake feature, as the case is a pouch style, and the magnets only designed function is to keep it secure when the case is folded up to be used as a stand.    With regards to auto brightness, I generally have this turned off, but I have had the case problem with auto brightness left on and off.       I was hoping I could just turn off the feature of the device that recognises the magnet.