My first device did approximately one reboot per day. I could live with that.
Unfortunately I sent the device back because of camera problems. With my second device the camera seems to be fine, but I have reboots on an hourly basis. This sucks, I would prefer to keep the first device and never shoot videos.
The 4G deactivation did not help. I still need to experiment with changing SIM slots, removing SD cards, etc. But basically I am just waiting for the big magic update.