Our new tablet was just updated with 3.1 . We are having weird issues while in sleep mode. Once we push the power button to enter sleep mode , we are able to push it again to wake it up BUT ONLY if we do it within 2 minutes or so. If we wait longer, it will not wake and we have to completly restart the tablet by holding the power button for 5-10 seconds. We do not know if it was doing this prior to the update because it was updated the same day we bought it. Is anyone else having this issue? We did try a factory reset but, no help. This happens no matter if we set sleep to 15 secs up to 30 minutes. Always the same result. We love the ACER but, it will have to go back if we can't stop this from happening. Thanks for any help or suggestions