Uneven burn lines on large cuts

Sorry to write in English. お返事日本語でも大丈夫です!
I have a 3.5 model.

I have no problems cutting small shapes. I use 300speed 100%power and 6 passes with 2.5mm MDF.

On larger shapes and especially straight lines I get these wavy burn lines. The board is stuck down with strong magnets so the MDF is not warped. The belts look OK and the laser head is clean. Do you have any ideas what could be causing this?
Thank you!

https://freeimage.host/i/FMl1Ox (Back)
https://freeimage.host/i/FMlEDQ (Front)

Hello, thank you for posting and sharing your matter here.
We have one thing we would like you to check;
Can you check if plate’s wheel indicates foreign matter or some type of deformation??

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!!!

Thank you! You are correct!

A wheel looks to be slightly damaged on the x axis! Thank you so much for your help, I wouldn’t have noticed that if you didn’t tell me. I will send you an email about purchasing replacement parts. Thank you again.
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IMG_20201205_123726

It works perfectly with the new parts!
Thank you for all your great help. I am so happy!

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