layershifts and not able to run performance mode without warnings

Random layer shifts on long prints. Sometimes a 10-hour print is perfect, other times a 4-hour print has 2–4 layer shifts. The shifts aren’t consistent in Z height or size (sometimes small, sometimes large “stair steps).
Troubleshooting so far:

Mechanics: belts are tensioned, pulleys grub screws checked, rails greased, no obvious snags in wiring/drag chain.

Z tilt adjust run before prints.

Shifts appear on both X and Y, not tied to a specific axis.
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