Elegoo Neptune 4 Bed Warping

The Problem

My Elegoo Neptune 4, which has been in service about two months, is becoming very unreliable when printing larger objects (around 200mm in any axis). So, I’ve been tinkering with bed leveling and even writing a macro to heat soak the bed to 80C for 10 minutes before calibrating and saving the calibration. I’ve also doubled the resolution of the calibration from 5 to 10 points on each axis to get a better look at the shape of the bed.

The bed has developed what appears to be a wave shape based on the visualization in the Tuning panel of…