Not receiving calls on FRX07.1

[rgviewer]

I have a question about the "FRX07.1_Full_Bundle_20110901". First off I have Rhod400 TP2 with CDMA. I put this build on my phone the other day and tested data and incoming and outgoing calling using my sons phone. All was good.

Except last night a few people called my sons phone trying to get a hold of me, they said they called my phone but was sent to voice mail. I was wondering if anyone else is having problems with this. Could it be that when it is in sleep mode the radio shuts off not letting me receive calls?

I really like this build and would love to go full time on android but if people cant reach me, then Im stuck with WinMoble. Any suggestions.