Loud Grinding with Z hits 0

[manifest3dg]

I just got my Elegoo Saturn yesterday and printed the test rooks and went to bed. The next morning with I woke up the build plate was all the way up and nothing stuck to it. Nothing seemed to print, nothing on the plate or in the vat. This afternoon I went to start a second print and when the build plate lowers to print, it gets stuck there and makes a grinding noise. I stopped it, used the manual features to move the plate up and down the Z Axis and that works fine, but when I press to lower the Z Axis to zero it does the same thing, like the endstop isn't recognizing it's at zero and it's trying to keep going. I updated the firmware to no effect. Any idea why this is happening or how to fix it?   PS: This is my first resin printer.

[url=https://www.reddit.com/r/ElegooMars/comments/dcty93/grinding_when_z_axis_gets_to_zero/][/url]