I was waiting for an important cal this morning on a vet appointment for my dog. My girlfriend called me, then she had her friend call me, I also missed several calls from work. Don't understand what happened. I had the ringer all the way up and silent mode was off. I even tried calling my EVO from my home phone and it didn't ring once but the call showed it was going through. I powered off the phone and restarted it and it seems to have fixed the issue. Hopefully it doesn't happen again. Has anyone else had an issue like this?