I do not have a Samsung smart cover, but I'm experiencing the same random hanging and rebooting. Often, after the spontaneous rebooting, I had no connectivity; the device just hanged trying to get an IP address ( happened in different spots, so it could not be due to the access point), and I had to reboot the device myself.
I've bought mine at John Lewis just before Christmas and was away for holidays when it started happening. Two days ago I took it back to John Lewis, they immediately replaced it, and everything seemed fine until a couple of hours ago... when it started to happen with the new unit! I noticed two things: it happened to coincide with the first time the battery got near to depletion (14%), and a major software update had taken place earlier in the day.
One third thing worth of notice is that it may be related with the fact I have an SD card permanently mounted on the tablet; check this thread: Samsung galaxy tab 3 8.0 keeps rebooting when sd card is on. The SD card I'm using with the new unit is also new, so it can't be the SD card itself; maybe it's some process trying to access it. Still, that is a bit strange, as I have almost no apps installed - just facebook, skype and a couple of trusted TV players (which, by the way, I had not installed in the previous unit).
Finally, it became apparent that the hanging / rebooting was always preceded by the spontaneous lighting of the tablet's front buttons.
I'm seriously thinking of going back to John Lewis and asking for a refund.
Svemirac Mars - did recovering an older IOS version solve your problem?
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