Jerome68

Hi all, I'm facing an issue to switch print core with my Ultimaker S5. I calibrated the lift switch successfully multiple times but when I launch a print, almost each time the print head fail to switch extruder. Why is it that the head misses the calibration like that? Where are these kind of information stored? I guess it's in the printer and not in the G-code. I had a few month ago PLA material overflow and I had to peel it off by heating the full head with a hot gun. After that the printer was working properly but maybe some electronic component was damaged in the head, is it linked? Thanks for your answers. Jerome