Random blotches on FEP

Hi,
I’ve been struggling with this for a while now. My Mage Pro is randomly printing blotches on FEP. The screen seems fine and I have calibrated the print plate. The problem is it happens randomly.

Hi Quintin,

Which slicing software do you use?
It’s hard to identify the problem if it happen randomly

Hi there,
I use Chitubox Pro.