Not going deaf
I think I stumbled across a bug - came here to find an answer / confirmation. I experienced a similar thing to what others are reporting. For whatever reason, I have NEVER encountered this until today.
After realizing others are experiencing low volume, I went back to the question "What changed" ... the answer for me was nothing.
Not sure which one did it, or if its a combo ... or random Neutreno corruption:
After listening to a Voicemail message (and then attempting to call customer care), then doing a PRL update: The volume seems to have lowered itself!
This is so low that in order to hear media that isn't via headphones, I have to hold the phone next to my ear at 100% volume to hear it!
I went back to the VM and toggled between speaker and regular mode during playback and its fixed / louder now!
HTH
--phillyun