[Solved] 40mm X Axis Layer shift!
Solved. Probably bad driver board. Exchanged it for a new one.
I'm talking about a massive layer shift here and it is repeatable. I thought it was octoprint after two bad prints. It started then. But I moved back to SD card and things went well for 8 hours then I fell asleep and found it just as bad.
I used Cura 4.8 to slice and it's a ender 3 pro. Every medium or larger print will shift - only once so it seems along X axis exactly 40.0mm. Of course my belts are tight, not like that could cause this...
Also it didn't slide i saw it on camera.