I've pulled the faucet apart and in the valve housing, there are two ceramic disks that rotate to mix the hot and cold water. I thought the piece was a single piece until I realized it budged a bit. I was able to slide the two apart in a shearing motion (rather than pulling them directly apart).
I couldn't understand how they were so stuck. I put the pieces together and pulled them directly apart and they were fine. Then I put them together and rotated them (as they would do in the housing) and that's when I could feel them glue themselves together. It dawned on me that the ultra-smooth surfaces were forming a vacuum between them as I rotated them. To the point where i could no longer rotate them at all, and had to forcefully shear them apart again.
This only began happening in the past week. Prior to that, the faucet worked as it always had.
Anyone know anything about what I'm referring to and whether there's any remedy?