Recently had an automated update on my Samsung Galaxy Tab3 10.1. All seemed to go well. However, system now very unstable, unable to open any docs to go files, unable to open kindle app -- any attempt of either causes system to restart; some restarts hang & on/off switch must be held down for 10 seconds to restart. Every time the tablet wakes up I have to accept that the memory card is "inserted." When I rotate tablet from horizontal to vertical or vice versa it hangs. Sorry for long diatribe but tablet is now almost useless & I'm more than frustrated.