My bottom bracket feels rough when I turn it with my fingers. I don't notice any problems when it's all assembled, but it's definitely not smooth like the other parts of much bike like my pedal axles. It feels like there's sand or dirt in the bottom bracket. Do you think it's time to replace it? It's a cartridge bottom bracket (Truvativ PowerSpline) so I don't think it's serviceable.
Here's a video of what it sounds like. The picture quality shouldn't matter, but you should be able to hear the sound. You might need to jack up the sound or wear headphones to hear it best.