Default [Q] Sound turns on by itself

I couldn't find any other threads discussing this so my apologies in advance if it has but I missed.

I recently updated to android 4.3 in the last week or so, and all of a sudden the sound turns itself on without me doing anything. I normally keep my phone in vibrate mode (from the notification bar) and once or twice a day, my phone will switch itself to sound on mode. Anybody have this problem or experienced this?