my phone has the sound problem. this irritating problem is really make me angry it’s just go into silence mode with all the setting was still on its maximum I don’t know how to solve this I don’t even able to hear any kind of sound when I receive calls message , mails or any notification that is not it I cant even able to here MP3 on speaker or on the headset I did everything but still not able to get to the result I even did the factory reset the phone but no successes its just temporary fix it but in the end it would be the same story
OK, so this is happening on a stock phone, so I suggest you contact HTC.