It is the system volume for certain noises you hear for notifications and so on
Especially the little click sound when pressing certain buttons and selecting items.
Mine does the same thing, though I just cant put my finger on when it happens
but it keeps going back to 100% volume
You can find this under settings>sound and display>system volume
Happening on my fascinate also. Is annoying as hell. The navigation volume should be remembered internally in the different apps (gps, games, etc) while the system volume for touch/click sounds should be what system volume works for.
(Note: Putting the phone in silent mode prevents this, however, if you do increase the volume while in Nav silent mode is disabled and system vol is maxed.)
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