Decalibration
I have just updated my Mk3's Firmware to the latest version. Prior to this, I have been suffering from decalibrations at random. Could the out of date firmware cause this?
Re: Decalibration
Do you mean that when you check your Z offset? Let's say you have it set for -720mm and next time you turn on the printer and check the Z height it's ZERO?
A few months ago and I don't know which version of firmware, but I could swear that I had that same problem. I don't know what I did, but I haven't had an issue lately. I have upgraded the firmware at least two or three times.
I think what I may have done was to re-flash the firmware.
Just remember, when you go through calibration it saves the Z values, but while you're printing and you adjust the Z height you have to save it or it will disappear when you turn the printer off.
I've got both of my MK3's disconnected and under the desk while I re-arrange the office so I can't look at the exact method of saving.
Re: Decalibration
No, I mean that suddenly it would no longer print correctly (e.g. the first layer height was no longer correct, or it couldn't make it past mesh bed leveling)
Re: Decalibration
try a factory full reset (all data) you may have corupt data that needs to be cleared
https://help.prusa3d.com/article/SYvbQ66IXF-factory-reset