Does anyone else have trouble receiving texts/calls?
Menu > Settings > System Updates/About Phone > Update Profile
In my experience, this problem is a carrier issue. I would visit a service center if it persists. Can you replicate the problem easily?
The only other issue it might be is Google Voice. If you've set it up, sometimes the texts will get saved to Google Voice and not forwarded to your phone. Try disabling it.
To disable visit www.google.com/voice and log in. Click the down arrow next to the gear at the right of the screen and select settings. Click disable to the right of your google voice number and click disable account now. Good luck.