My Joule started reporting error codes (blinking red light) while trying to do a cook. I had to do a deep cleaning because there was debris in the propeller and wrapped around the shaft. I suspect there was a label or something like it that got into a previous cook on a bag and dissolved enough to enter the Joule.
The bottom magnet unscrews and the red propeller just pulls off. I had been doing the 50/50 vinegar jar rinse every 3-4 months depending on use. This debris would have been unaffected by that process.
I really thought I was going to have to junk the Joules, but after the deep cleaning and 2 additional vinegar flushes, it's back and able to handle log cooks, thus far. I'll take a bit of luck with it.