After having the pickup chain break twice in the same day (it was a one year old chain) I investigate deeper to find I have a bad roller, aka cam follower. I ended up replacing all 4 rollers which was a VERY good idea, because the other 3 rollers were definitely on their way out as well. For $22/roller, it doesn't make sense not to.
Also, be sure to also check the cam track and make sure it is not broken anywhere.
