I woke up this morning and my nVidia Shield tablet is acting funny... It booted up to a screen saying "Android is Starting" "Optimizing App xxx of 141" and when finished, reboots, and repeats. I looked at a bunch of stuff online, and I found people having this problem in relation to Lollipop, but I believe my tablet has Marshmallow. And the people also said that it just did this once every boot, not an endless cycle like mine. So I tried the recovery/clear cache anyways, but that didn't help. I also removed my SD card and rebooted, and then put it back in and rebooted again, and now it's not doing the "optimizing app" anymore, but only the nVidia screen followed by black. Anyone had this problem? Also, will a factory reset delete the apps I have stored on my SD card? I do have it set as an extension of my internal storage... does that mean if I do a factory reset, that everything on the SD card will be useless anyway, unable to reconnect it to the new reset factory system?