With the power to the disposer turned off, see if the blade is loose. Unfortunately, we do not carry parts for Insinkerator brand, so I wouldn't be able to help you there.
I found a breakdown diagram for Badger 5 and a place where you may possibly get replacement parts from if needed (we haven't dealt with them, so "buy at your own risk"). Hopefully, you could just tighten the blade a little.
Site: Insinkerator Badger 5 Parts from FAMOUS PLUMBING SUPPLY
Hope this helps.