I provide this info to help those who like their Note Edge but they are still having trouble with the Marshmallow update.
Of course like yourself I was told to reset my phone and clear the cache and none of this worked. My phone kept rebooting over and over again.
Well I saw on Friday that my phone reported that Touchwiz wasn't responding and then there would be a reboot. Usually this occurred after coming out of a "doze". My phone reboot itself multiple times a day, sometimes the reboot would occur for no reason. Most of the time the reboots occurred trying to login into the phone.
So I looked around and tried to see if I could take away some features of Touchwiz. I found that I certainly could not disable Touchwiz altogether however I tried to see if disabling "animation" could help. And disabling Animation absolutely has resolved my reboot issue.
To do this I went into Developer Options and disabled animation. The default is to use a rate of "1x". I shut it off and my phone has not reboot even one time. To get into developer mode, hit the build number under settings multiple times and you will get 'Developer Options'. To get to the build number, open the Settings screen, scroll down to the bottom, and tap About phone
Now I wanted to see if this was really the resolution so I enabled animation and my phone reboot again within 15 minutes.
Below is a screenshot of the developer options where I disabled Animation. The phone does not look as pretty with animation off but it is better than having the phone reboot constantly. Good luck!
