My 1st gen Nexus 7 suddenly started turning it's self off and freezing up on reboot a lot. Will be working fine then just locks up. Several of my app's have been been getting updates so I tried uninstalling them which seemed to work for a while then back to freezing up and turning off. Have tried the cache wipe,factory reset, taking the back cover off to check for loose connections. This unit has been in a Dodo case since it was purchased,has had no hard falls and I am starting to feel like this a Google built in app update issue. Any thoughts?