I have developed a new problem with the puck sticking to the shower screen of the EM6910. I can get it off by loosening the PF and using the manual button to deliver a one or two second burst of water.
What are the likely causes for the puck sticking to the shower screen?
What are the likely causes for the puck sticking to the shower screen?

The final polish is with almost no pressure - just the weight of my hand. I get better extractions now. However, I had the stuck puck problem even before I adopted the above technique.
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