MatKarol

Hi all, I have really annoying problem with my UM S3 almost every time i try to start print (45/50 times) during auto leveling procedure printer going out with: "Nozzle offset probe failed. Please check the nozzles and bed and try again." and cores most times even don't touch build plate, some times it gives also error: "Difference between detected height of both PrintCores exceeds realistic values. " I was looking on forum for some answers and tried a lot of proposed solutions: 1. cleaning nozzles and bed. 2. calibration of lift-switch 3. checked captive sensor wires (both ok and giving signals properly) sensor noise is 12.7 from printer test test 4. checked different print cores configuration (got 2x AA0.4 BB0.4, AA0.25) only difference i spotted it is it sometimes go ok with core 1 sometimes with core 2 or both cores failed to touch build-plate 5. printer firmware is up to date and maintenance is performed regular 6. was checking different power cables, powering from UPS, connecting to really good grounded power outlet, in location where is no electronic devices at all (at least 3m from closest) is there anything i should check? or just replace sensor should help ?