Layers sticking to bottom of Vat (flexible FEP)

My form 3 worked great for a while. Now I seem to have a repeating error with layers sticking to the resin tank. not every print- sometimes it works fine. The tank and resin are new. I print mostly miniatures/ sculptures for casting. Im starting to get frustrated and feel like I’m throwing money out the window every time I print.

anyone else have this issue?

Is it one of the first layers, or has the model partially completed? Maybe you could provide a photo?

For example, I have observed with some small parts I print, if the section that has contact with the build platform is substantially smaller than a cross-section further up the print, the peel force may pull the model from the build platform.

Ever clean your LPU window?

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