Sometimes PCB klicky probe is unreliable

[lord-carlos]

Printer Model

voron 2.4

Hello

I have a PCB klicky probe and most of the time it works great.
Just now I turned the printer on and did a few PROBE_ACCURACY tests on different places on the cold plate. It went great.

probe accuracy results: maximum 4.755000, minimum 4.750000, range 0.005000, average 4.751875, median 4.751250, standard deviation 0.001505
probe accuracy results: maximum 4.522500, minimum 4.517500, range 0.005000, average 4.519250, median 4.518750, standard deviation 0.001392
probe accuracy results: maximum 4.425000, minimum 4.416250, range 0.008750, average 4.421750, median 4.422500, standard deviation 0.002385

I turned on build plate and extruder heater for PLA values and redid the test. Still all gucci
I did a QGL and it went through without a hitch.

Then I started a print and I get this on QGL

// probe at 250.000,25.000 is z=8.810541
// probe at 250.000,25.000 is z=8.803041
// probe at 250.000,25.000 is z=8.800541
// Probe samples exceed tolerance. Retrying...
// probe at 250.000,25.000 is z=8.801791
// probe at 250.000,25.000 is z=8.804291
// probe at 250.000,25.000 is z=8.821791
// Probe samples exceed tolerance. Retrying...
// probe at 250.000,25.000 is z=8.828041
// probe at 250.000,25.000 is z=8.828041
// probe at 250.000,25.000 is z=8.830541

Similar problems on all corners.
wat.jpeg

With the probe still attached I run an probe accuracy test again and it's great.

probe accuracy results: maximum 8.857435, minimum 8.849935, range 0.007500, average 8.853435, median 8.853685, standard deviation 0.002222

Other times everything just works™