Okay... so I've been using lube for quite a while now (by myself and as an escort), and have only recently come across this problem.
I've had a number of bottles of lube turn cloudy, with white floaty stuff (and no, it isn't cum) in it after being used. Sometimes it has happened when the bottle is almost empty, and other times when the bottle has only been used once.
The consistency of the lube changes, as though it's been curdled, and it separates and becomes very fluid and watery and doesn't maintain its slipperiness. I tried shaking it, thinking that it needed to mix back up. This doesn't work at all. I don't know if this is an issue of water and silicone mixing (I use both together at times), or if the batch has gotten contaminated with mold, my body chemistry, or what.
It's happened with a variety of lube brands and I haven't found anything online to suggest a solution.
Anyone else had this problem, and found a way to avoid or fix it? This shit is expensive and I don't want to ruin any more.