I listen in a home office which has my music server and stereo, and also a PC for work/pleasure. Typically I'm at the computer and listening to music from the audio system.
Recently seemed that I'd lost volume (3-6db) in the stereo. Was turning the volume up a couple of notches more than I'm used to.
Couldn't figure out the problem, and then yesterday had to do some serious maintenance on the PC (reformat and rebuild the main C drive contents).