Glitch repeated after 45mm in Y approx. Overlapping lines

[javapast]

Hi there,

I have been working for months with no problem, but suddently this started to happen (phot attached). Not idea if the software is missing lines or it repeats the next line/s in the same spot. The weird thing is that it happens only in lines arround 45mm in Y of the image. I am using a sculfun S30 and this started arround 1 month ago, not sure it it was with a new software update. Is it possible to get previous versions? I cannot find them

Thank you!

[Hostaler]

You should check the tension of the belts and if you can send an image so we know where the 0 of the X and Y coordinates are on your machine.
Also check if the belt in that Y dimension has dirt between the teeth.