@PY5VC Hi, Just wondered if it was the same problem I had with my Ender 5 pro. I found out that after every bed levelling and setting the Z-offset, I saved it to EEprom. After that it retained the settings.
On my 5 pro, the eeprom settings are actually on the SD card. This meant that on my printer, I had to make sure that the eeprom.dat file is always on the SD card. Hope this helps.