Who I have the same questioned this topic

My in call volume is now very low, but still clear, after the upgrade that was pushed on 4/7.  I installed it late that evening and then during two calls yesterday found that it was hard to hear the person I was talking to, but they could hear me fine.  I've run through the troubleshooting steps listed in the online support tool, short of a full factory reset (need to back up my data and want this to be the last resort).  
Speaker is fine, all other sounds are fine.  This isn't the best time to go without my only phone, and obviously can't really go to the store for help right now.  

Any other ideas?  Suggestions from Support?