I have a rollerball mouse [can't use a real mouse anymore LOL, I get so frustrated with it] and have the same problem, I use a lot of hand creams n stuff. I usually give my mouse a wash once or twice a month becuase it will start jumping. Never had it start to close things on my though.
Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the present - Oogway [Kung Fu Panda]