cut not straight

[Plan30]

Hello,

I've got a problem with the cutting.
Sometimes (no specific time, line, material...), the cut "shakes" !
Has somebody an idea of my problem's origin ?

Thanks !

Vincent

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[AmyThunderlaser]

did you check:
1. is the laser head loose?
2. is the lens and mirror loose?
3. is the belt loose?
4. is the material loose?
5. is the machine shake?