After a failed update to 5.1.1 and it "bricking" my N7, I contacted ACER and they actually put in a ticket and after shipping it to them, they wiped it and reinstalled with 5.1.1 and sent it back within a couple of weeks. They acknowledged it was an issue with the tablet and not owner use, so there was no charge other then shipping it to them.Within a month it started to overheat, mainly only when playing games and eventually freezes and gets that "blacked out" screen for minutes before if eventually reboots itself. Not a happy camper. I noticed someone mentioning upgrading to 6.0 marshmallow if possible, I wrote ACER and they said that a lot of the N7s were not able to take the 6.0 upgrade and there was nothing more they could do. I've read elsewhere it has to do with the motherboard that was used in earlier productions. And to get the battery to last, even when not gaming, I have to keep it in Battery Saver mode all the time. I'm looking to replace at this point, but I'm not seeing a lot of devices with Marshmallow 6.0 except the Samsung tablets and they are running $400-$600.