HTC One X :: Service Lost - Reboot Brings Signals Back

I recently got the HTC One X on 3. I have been having issues with the signal. At my house I receive full service from 3. Every now and then the signal drops and I get Emergency Only calls & that is how the phone remains. If I power off the phone the signal is recovered back up to full strength. The same issues happen if I am driving, sometimes going through an area that has no signal and then returning to a full signal area the phone fails to recover this signal unless rebooted.

This however does not happen every time which does seem strange. I have been told by HTC that they have not heard of this issue before, and all they can do is repair the phone. The phone is barely two weeks old and has to be repaired!!! Not good. I previously had a Desire and had very few issues apart from lack of phone memory. Is it 3 that have issues, which seems unlikely to me, or is it the phone. If I send it away for a repair I will be without a phone which is very annoying to say the least. I really don't know what to do.