I have a record 10sp chain that seems to skip just a little if I am pedaling hard and shifting up a gear. It seems like it skips and then clunks into gear. Chain has around 2k in miles and has been properly lubed and maintained. Does this sound like it may need replacement? I have not measured the chain. I am a light rider (145lbs) and don't think I have ever worn out a chain. Thoughts?