Since upgrading to v3.5.1 (from 3.5.0) I keep getting X layer shifts on long (10+ hour) prints.
The only change to the printer is the firmware. Belt tension is fine.
No problems with the printer previously.
I'll downgrade to v3.5.0 to see if any better - I wasn't on that version for that long, but didn't have any issues.
I have a MMU2 which went from v1.0.2 > v1.0.3 at the same time as I installed v3.5.1, but I don't think that's responsible for this issue... these are all single colour prints that are going wrong. MMU2 has a whole load of it's own issues, but i'll keep that discussion elsewhere
So far i've had 3 prints and about 1/2 roll of filament wasted due to this, as well as loads of time, NOT impressed Prusa!