That plate under your heatbed looks like it is wood. Is it? If so, it might shrink due to heating, and cause stress or even movement in the connections between this plate and the heatbed. Maybe you can test this by waiting with printing after heatup until all materials have settled, so this possibke shrink happens before printing, not while printingby ipster - CoreXY Machines
Basically, any belt section that changes length during xy movement needs to be parallel to the movement directionby ipster - CoreXY Machines