The one Ive read about involved call audio completely dropping out while the call is still going...

Sounds like your issue is something different

 

The "silent call" or "audio loss" bug symptoms are all of the following:

1. No sound in a call.
2. No ringtones, notifications, or media sounds.
3. Dialer lags if you're trying to enter a phone number.
4. Battery draining quickly.
5. Doesn't revert to normal operation until after a reboot or soft reset.

If you have only one or two of those symptoms, you don't have the bug.

The bug usually shows up right after a successful phone call, although you usually won't notice until you go to place the next phone call, for obvious reasons. When I had the bug, I made it a habit to press the volume rocker up and down right after a call, to make sure I didn't get the bug.

Some have had it occur a) during a call, b) after listening to music, c) when connecting or disconnecting a headset, or d) randomly.