I play a Soprano and I'm moderately experienced, but one problem that I suffer is that I sound strings when I release a chord. It's like my fingers are sticky or something (even though they're completely dry). So on a quiet piece I end up with an unwanted 'pull-off' chord as I lift my fingers.
Somebody told me that players of Spanish guitar rub their finger pads on their forehead to pick up some of the natural oils on the skin to avoid this. Not sure whether that's true or not.