please help -- my build plate getting stuck on the fep vat

1 Months+ 60

What setting could cause the build plate to get so stuck to the fep vat that it will not lift at all.  To remove the build plate I have to unscrew it and unscrew the fla vat.  On my mars machine this caused the the build plate to no longer go up on the axis.  I have the saturn now and the last print did the same thing as the mars.  What setting could cause this?  Any help I will be grateful for as the saturn was so expensive I don't want to break it too.

TIA

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