Hi, i've had my google nexus 7 (2012) tablet since christmas 2012 and its been absolutely great until recently, I constantly get the 'unfortunately ......... has stopped' on pretty much every app, so I turned it off the other day and when I went to turn it back on it was just stuck on the floating circles for about 35 minutes, I don't know what I did but I was just turning it on and off and it finally turned on, and yesterday it did the same thing but would not go off the floating circles for about 4 hours and I was about to factory reset when it FINALLY came back on but since then I've been getting the 'unfortunately .......... has stopped' constantly and I dont want to turn it off in fear of it getting stuck on the welcome circles again. Someone help please, I don't really know much about tablets and rooting and stuff and it's really stressing me out now :'(