Is the RED x popping up because of a protocol error or timing out because you are out of service?

I remember my messages retrying while waiting for service to be re-established, but did receive X's too under because of a protocol errors. May not be something you can overcome. It may already be trying and just gave up after x number of times.

Would you really want it to continuously retry and kill you battery because it was using the radio so darn much?