My iPhone 5 is getting very hot and battery drains quickly.. normal?

I've been having a variety of signal related problems with my iPhone 5 and I'm wondering if anyone can offer any advice.  From day 1 I have observed that my phone will have poor signal strength or will switch from 4G or LTE into Edge mode, even if my wife standing right next to me (same network same iphone 5) has better signal.  Phone also frequently gets quite hot (to were it's uncomfortable to hold).
I did a long hike last weekend and in the space of 3.5 hours, while doing nothing but listening to music and taking a few photos, the phone was nearly drained (20%).  If I tried to take a photo it would simply shut down after pressing the shutter button.  I also had no signal (phone was searching), even though other AT&T iphone users around me had signal and were texting, making calls and sending photos (this was from a mountain top so the temps were quite low).
Apple diagnosed the radio in my phone and said it is fine (good attenuation and no dropped calls).  They recommended that I wipe the phone and set it up as a new phone versus restoring from a backup (what a pain).  I did this and while returning from an outing yesterday I had 3 bars of LTE signal and noticed that with just light browsing the phone got very very warm and the battery was draining quickly.  In the space of just an hour the phone plummeted from 75% to 30%.
I'm trying to determine if all of this is "normal" or if I should demand a replacement phone.  I have tons of Macs, iPads, iPhones, etc (for both myself and my wife) and I've never seen Apple so reluctant to do a hardware swapout as they were when I was in the store yesterday.

Did you transfer the backup for your 3GS to your iPhone 4S?
Try a reset, which is done by pressing and holding the home button and the sleep/wake or on/off button simultaneously until you see the Apple logo and then release.
If no change after a reset and you transferred the backup for your 3GS to your 4S, try restoring your 4S with iTunes as a new iPhone or not from a backup to see if this makes any difference.

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