Battery
Let me +1 the last post. I have found a really good verizon rep, who has put up with me swapping out 3 times. On swap # 2 after he looked at the phone, he said 'you know what, I think the phone is good, but the battery is bad'. He opened a new Rezound, used that battery, and my phone heated up so he swapped it. Ironically, he swapped it for THAT Rezound with THAT test battery, and that Rezound was actually worse.
My current Rezound may SAY it gets hot with Battery Indicator, but it doesn't feel hot, unlike my prior 3 phones. But the part that does get warm is definitely the center (Battery), and not the top or bottom.
I believe that we may, in fact, be seeing bad batteries rather than bad Rezounds. When you 4G or something that starts pulling juice, the battery would naturally start to heat. If this phone stays stable for me, I might just buy the extended battery and see what that does.
My 2 cents.