Need Help Flat bed printer horizontal banding

[Janis Karasnieks]

Hi!
I have problem i never seen before..
Printer: Imprimo Lithium 300 UV LED.
There is horozontal banding
In some colors its more visible in some not.
they are always in same distance from bed 0 point...
Its does not mater do i start print from 0 or from 100mm first (yes they are on all table) banding will be ~ 380mm from bed 0. Same for all other - they are in same bed possition.
Do anyone have ideas what can cause it?

 

[Janis Karasnieks]

As no one here was able to post any ideas, we sorted it out by our self... after many hours of diagnostic we found a problem - this banding was caused by damaged teeth on timing belt.
Hope someone will find this information usable.