Hello Hikerlass,
most likely, your IP-5 HW is *NOT* the reason for this issue.
Me and some other people expect, that a SW-patch will solve it.
Have a look on my post some days ago here in this thread.
I made several tests (time measurements) and my conclusion was: When using the 3G data connection, especially when WLAN is running in parallel, the transmitting unit seems to have unusual (high) demands. If you, for expample, only use WLAN connection (mobile data off), the HW surpasses the given specifications.
I´m sure, that the Apple-People well recognized this (relatively long) thread here and I´m confident, that they will solve the problem as soon as possible.
Edit: In addition, an high amount of IP-4 and 4s users also suffering on battery drain from their devices, since updating to IOS 6.
Sometimes, an error occors. Although this is Apple, they are only humans there, no aliens :-).
KR
Dive_Fun