For those who use K/X lube
I replaced my plastic bottles with glass ones. The lube remains clear after checking on it 24 hours after I mixed it. This means it was the plastic bottles were going bad and not the lube! I never threw out my old bottle just in case that was the problem.
For this reason, I highly recommend you replace your plastic bottles with glass. Glass won't degrade or leech chemicals into whatever is in the bottle. If you do continue to use plastic, be sure to replace it every three to six months!