Right after I received my N810 I did the usual and installed everthing I could get my hands on. I uninstalled most of it, but one of those apps left something behind that was causing my N810 to do the same thing yours is. If you haven't reflashed it, I would definitely try that before RMA'ing it. Reflashing resolved my problems. I then reinstalled only the apps I actually wanted, and I backup more often and use more discression when trying new apps.