my blackberry bold has been acting up. Whenever i attempt to make a phone call, it begins to make the call and then the call fails. I am also having sporadic luck in sending texts and emails out from my phone. I have rebooted and swiped my phone as well. I have cleared everything and backed it up and then loaded all of my data back to the phone. It worked for a few phone calls and then it went back to the normal situation. I took it to a store to see if someone could help me with the problem, but they were unable to fix the problem. Any suggestions?