Is it a rollerball one? If it is, take out the rollerball and clean all the rollers with rubbing alcohol and q-tip. If that doesn't work, you're right, your mouse may be worn out.
If you get a new one, let me reccommend an optical mouse. No rollerball cleaning.
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“I've learned that people will forget what you said, people will forget what you did, but people will never forget how you made them feel.” ~ Maya Angelou
Karma is a boomerang.
Trying to read 52 books in 52 weeks.
See how I'm doing