Hey Alex,
You don’t give much information.
Which axes are affected?
How big is the portion of axis travel where the problem appears?
Which machine are you using? As a hobbyist Sherlock Holmes, I deduce: Joystick = Original/X-50/PRO machine. But which one? Do you already have a PRO Series that already has the 30 mm drag chains from Elite Series, or the old models with lacking strain relief and where the curly Z cable that can break internally after a year or so.
How long have you been using it?
I would check the points in this support document one by one:
Also have you ensured accurately that your machine is rectangular (“squared”) (➪ bar gauge) and coplanar (“not twisted”) (➪ fishing line method)? If it is not adjusted, Y movement can block. Coplanarity of the machine is often underestimated (machine not being twisted).