Hello! I have had my HTC HD7 since the end of July, and it has been working great. Although, last night I noticed that there is no longer any sound when a call comes in, when I type out a text message, and when I lock my phone. I did a test call, and the sound works for calls, but no longer works for any of the things I have mentioned. I have the ringer volume all the way up, the sound for typing is on, and I have the locking noise on, too, yet it doesn't work. I have tried resetting my phone, but to no avail. Any suggestions on what could help return the sound?