I went riding Friday and noticed that when pedaling especially under load, there was an odd sound. At first I thought it was the chain slapping. I then realized it was coming from the BB/crank area. Is this a sign that it's starting to go, or does it just need to be lubed up? I have probably close to 200 trail miles on it and many, many hours of trainer time this winter adding up to the equivalent of probably over another 200 miles. Could it ust be worn out at this point? It's my first MTB, which was in the starter price range, so it's probably not the best BB, and the manufacturers web page does not say what kind it is. It's a solid HT frame, and have no problem upgrading since the frame should last a very long time.