I have g7 active. Same problem. Pressing lower right side of the phone solves the problem for some time. Looks like mfg problem.
I don't want to hurry but i managed to get rid of the sound problem for some time.
I went to Settings > Advanced Features > and here I've disabled everything except Quick Camera Launch.
I don't think its a hardware problem and I will tell you why.
If i'm in Facebook and the sounds stop working, i can still hear the sound from haptic feedback. If the facebook does not give any sound and still hear a "click" when pressing "back", its not a hardware problem! but a firmware/software one.
I have my phone brand new for like 2 weeks and the problem first appeared 3 days ago.
Regards!
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