Wow what a great question that is answered in a direct and legally binding way right in... your contract you signed!
Yeah, just read it. You don't have to be a lawyer.
That said, it probably says you need to provide notification you no longer wish to be a partner within 30 days of it expiring or it auto-renews.. but it could just as easily say you need to provide 90 days warning within the last 120 days... or it could say you need to send an email on the blue moon prior to the end of your contract term... or it could say you are stuck their for live with it never ending and automatically renewing forever.
Seriously read your damn contracts people.
Personally I removed ALL autorenewing language from my contract.