Bought a Venue 3840 for my son last week. He took it to school Friday and today (Monday) and when he removed from his locker at the end of the day it would not wake up. Both days he brought it home and I tried different combinations of buttons and nothing would wake it up. Both time I had to remove the back and unplug the battery for a minute then plug it back in and it then would wake up and be used fine. Didn't have a problem over the weekend. Any ideas as to why it won't wake up after being in a locker at school?
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