Hi, my wife has an Orange branded HTC Desire and intermittently the phone stops making a noise when someone calls or an email/text arrives. It operates as if its in silent mode even though all volumes are on full. The only way I've found to get it working again is to re-boot the phone, this solves the problem for a few hours but eventually it reverts back to silent. I've trawled the forums and unusually can't find anyone else with the same issue and I wondered if anyone could help. Forgot to say when it's not working correctly I've tried adjusting the volumes but that doesn't work but also if I try and adjust the ring tone the phone doesn't play a sample as it should. This also goes for the alert tone, it's completely silent. Any help would be appreciated.