It is a total crap shoot, I'm betting there are some who have turned in a modded phone and were not charged full price for the replacement, but I wager that there are many more who were charged full price as rooting/roming/flashing different os, does void your warranty and why would Verizon give you a free phone when they can charge you 600 for it? Even if it is a hardware issue, I would bet Verizon will claim the issue was caused by an unofficial leak being installed on the phone, its just how big companies play. Sorry you having problems with the phone, ultimately the choice is yours as to whether or not you chance it.
Best of luck to you mate.
Best of luck to you mate.