I am having consistent problems with this printer remembering its z calibration after it has been powered down. Almost every time I start it up and begin a print, the bed rises too high, pushes up on the X-axs carriage, and the nozzle scrapes the glass when it comes off the wiper. Each time, I have to go through the bed leveling procedure. Sometimes that works, and sometimes it results in the nozzle being a couple of millimeters above the glass after I store memory and restart the print. I have NO idea why this thing cannot function reliably after it has been powered down, and am becoming really frustrated. My delta, for all of its other faults, can power up after a month of being idle and still be bang on for z calibration. Either I am missing something obvious, or there is a fault here that I have not appreciated. So, if anyone can help me retain the hair I have left, I would really appreciate it.