The spindle shaft moves

When a 52mm hole is processed, it almost fits in the X-axis direction, but it is processed to be about 0.2mm smaller in the Y-axis direction.
If you move X and Y by the specified distance in the test, then it moves exactly.
However, there is a problem when processing.
I think the problem is that the spindle shaft is not properly fixed and moves when you hold it with your hand and shake it.
Where should I repair it?

I’ve looked it up a little and I think it’s the same problem.