Droid Maxx Black Screen Of Death

Background, I have a Droid Maxx that I purchased/leased from Verizon, that arrived with 6-7.2. I downgraded to 6-7 and rooted. From the time of purchase the phone would reboot a few times a week. After rooting it began to reboot usually daily or many times a day. A week ago on Saturday it rebooted and began to loop from splash screen and back off. After many restarts it went into the factory recovery and no options would work and the screen forever went black. It has been charged for days, no button combinations work, except when plugged into the computer while holding the down vol it will load the hsusb drivers will sometimes load, and occasionally when connected to the computer or wall charger the green led will light. So I took the phone into verzion and they see the same results and attempted to charge it with both a cable and wireless, same results. So they shipped a new unit to me and before shipping this old one back to them I have a few questions for ones of you that may know the answer:

Anything I can do to restore it to stock? I assume no from my research
Will they discover its rooted?
If so what will be the resulting action?

Thanks for taking the time to read this.

Black screen of death since 5.1.1

Ok guys it started since I migrate to 5.1.1 ROM, flashed clean DN 0.3 note 5 port, and the phone would just go black at least once per day, nothing seems to work even a hard restart (volume up + power button for 20 sec) only a battery pull would restart the phone. So I figured it must be the ROM ( noone in DN 0.3 thread seems to have this problem) . So I flashed the original 5.1 firmware for my country, rooted it and used it for a day to find out it does the same! I'm really not sure what seems to be the culprit. I couldn't find a conclusive pattern on the bsod however last time I noticed it happened right before I was disconnected from public wifi, perhaps it is the modem? Maybe it's root and bootloader conflict with 5.1 firmwares? (the phone boots up, so it cannot be bootloader? Or I don't understand something about what bootloader does?) Any one has encountered the same problem? Any clues on how to fix it?

Death star plans.

I really wish handset developers did not have the right to hide source code.
Because there could be anything in there.
There could be plans for the death star and we would never know.

I know some of them think that it gives them a edge over the competitors but really it's childish "mine! I made this!" sort of brain power that screws over rom developers.
And like I said there could be anything in there.
For all we know the hardware it self could be spying on you, infecting your pc, acting as a proxy for illegal activity ect.

Please discuss.