I'm not technically savvy but I know exactly what you're talking about. No calls in sleep mode...half rings...etc! I had the same trouble when I first got mine. In fact, I was on my way back to the Sprint store to return it when I remembered someone on another board talking about a "soft-reset". I pulled off the road and into a parking lot. I pulled out the book (I had it all boxed up) and followed the directions for a soft-reset. Problem was fixed and I have not had an issue since.
Note...One of the first things I did was install the full screen keyboard. That MAY have been the original cause but the reset was definitely the answer.
Hope this helps!
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