I have a DIY 3D printer that uses a probe as z min limit and bilinear bed leveling. The problem is that bed leveling compensation sometimes doesn't work.
This is in my starting scripts in Simplify3d:
M106 S200 G28 G29
Upon printing, it turns the fan on, home all axes and bed leveling is done perfectly but sometimes when I start printing, Z-axis compensation doesn't work. It's random, often when I restart my PC it fixes the problem.