Shaky lines on burn at increased speed

I used to run Lightburn on speeds at 2000mm/min without issues before. Now when I run it. It creates shaky lines, appears to be prominent when shifting from y axis to x axis and higher speed. 2000mm/min is worst, and it marginally improves when reduced to 1000mm/min. 750mm/min looks better, but still shows sign of it. See image.
What is wrong? It is an Ortur LM2 on 5mm belt rollers. Please guide me.

when laser is doing those lines on X, you see Y axes moving?
on LM2 X move on a carriage with wheels, check if the eccentric on both bottom wheels are tight enough to avoid shake but soft enough to let you move carriage softly by hand with no effort

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