I reduced the acceleration to 1100 and it works just fine again.
Either it was mechanical (pulley) or overheating of the stepper motors.
Umo+ in theory (unless if it's summer in spain) stepper motor chips can't get hot enough. Try to check the calibration. Adjust the pulleys and check the small belt tension. I can print very fast with aceleration at 2000-2500 and travel moves of 200. Of. I changed my belts/pulleys to gt2 but I been using that speeds with the mxl stock without problems.
Either you have a loose pulley somewhere or the short belts are touching the woodframe
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