My sprint HTC hero for some reason will all the sudden stop allowing me to get txt messages and mine that i send dont seem to reach the phone im sending it to. It will stop working out of the blue and start back up. The only reason i know that it stops is because the person i am txting shows me that they never received a message from me and i never got one from them. My phone does not tell me i cant receive or send it just stops and i never know. When it starts working again it does not ever send the messages i didn't receive. Is anyone familiar with this issue?