Mode changing from Vibrate to Mute while screen locked and off

[Bartdude]

Got the update last week and not enjoying it so far (have yet to do factory reset).
My main problem (besides lag) is that my phone keeps going to Mute either when I grab it or whatnot, I'm not sure. I keep on Vibrate and keep it in my shirt pocket typically (at work). It seems that handling my phone I somehow change the speaker modes without knowing it. Is there any way to lock the mode so that it won't change when the phone is locked? I don't mind being able to change the volume of audio output when the screen is off but for it to be able to switch to Mute or On is not something I want.
Any ideas?

 

[Bartdude]

Ok, tried several different options and finally did a factory reset. That seems to have stopped it! My girlfriends is doing the same thing so I'll reset hers this weekend.