OK, so I have a fairly new XX drivetrain on my niner air 9. The components have less than 500 miles. Occassionally, the chain will skip on me. I thought that maybe the chain was the issue, so I replaced it with a new 1091R chain. I took it out today, and over a 25 mile road ride, the chain skipped 3 times. It bothers me, because I'm afraid that it might skip at a bad time, like when I'm climbing hard, and could cause me to crash. I'm not sure what could be causing this. Does anyone have anything I should check?