Correct answers
This may or may not have any impact on your situation but in the past I've run into issues when there have been major Android updates (ie Android 4 to 5, Android 5 to 6, etc). I didn't this time, thankfully. In the past when I did suffer major problems it almost always turned out to be related to a third-party app that didn't function properly.
With the above being said, in the past when I did suffer major problems it almost always turned out to be related to a third-party app that didn't function properly. I'd wind up with crashes, reboots, the phone getting very hot, the battery draining quickly, etc. If I did a factory reset everything would be fine until my apps were reinstalled. I then had to weed through all the apps I had installed to locate the problem app or in some cases multiple apps. I've had some apps in the past that fully claimed to support the newer major Android versions but they either didn't or there was a major bug because it wouldn't work properly even after a reset and clean install.
Long story short, is your problem happening on a clean fresh install of Nougat (ie factory reset) or is it after you're reset and then added back all your apps? That could make a difference and it's always possible that that is the actual problem. Of course I am mere speculating and sharing my prior experiences with issues related to major updates and I could be entirely wrong in your case. Just food for thought!
PS: I'm not saying there isn't an issue with the Nougat update and/or your phone! Just providing some input. 
Your mileage may vary.
