Hello everyone! I have had my Huawei Mercury for a year, and a half and I really love this phone! A few days ago I noticed that I didn't hear the unlock screen sound when I unlocked my phone, and the pop sound you hear when selecting apps was also gone. I restarted the phone, and no luck, so I deleted a couple new apps that I had downloaded, and took out the battery for a couple minutes. Once I replaced battery, and powered up the phone, the unlock sound, and app selection sound were back... 
The very next day, I noticed it was gone again, so I did a battery take out again, but it was still gone. I have tried everything I can think of, and it is still gone, it's been 2 days now. I made sure the box is checked, and the sound is turned all the way up, I just don't know what the issue could be. I also notice that it doesn't make the sound to let me know the charger has been plugged in. Can someone please help....factory reset is my last resort to try to fix this. Thanks in advance!
The very next day, I noticed it was gone again, so I did a battery take out again, but it was still gone. I have tried everything I can think of, and it is still gone, it's been 2 days now. I made sure the box is checked, and the sound is turned all the way up, I just don't know what the issue could be. I also notice that it doesn't make the sound to let me know the charger has been plugged in. Can someone please help....factory reset is my last resort to try to fix this. Thanks in advance!