Rostock Max v2 Shuts Down While Moving In Z Axis Direction

[Pyropainter]

Good Morning

I have recently purchased a used Rostock Max v2. This printer operated the way I would expect it to. After some use the resisters had to be replaced. Also I adjusted the belt and cheapskate tension. Now when I move the the in the z axis direction. I believe the distance to be random. The machine shuts down and has to be rebooted. This happens manually and while issuing commands thru a host. I have tried moving Z while the machine is up to the suggested temperature in the calibration section of the assembly manual (Nozzle 200 Bed 50). It doesn't seem to make a difference. Could the belts and or cheapskates be too tight (it is possible, but it is also hard to quantify the calibration to something that can be measured). I tried to search this forum and the web for information that would correct this problem. No luck. I am probably not asking the right questions.

A couple of other questions that I would like to address are as follows and are questions that are observations since I started using this printer. These might be the nature of the printer but they still leave me wondering why.
1. While moving the Z axis with the rotary dial on the LCD I noticed that the readout of the axis appears to skip .01mm. The readout displays all increments of .01mm except it skips .01mm while increasing and decreasing from .01mm to .03mm. Does this have to do with the firmware?

2. While using the rotary knob the Z axis seems to be a bit jumpy unless I am very deliberate in pausing between the steps of the knob. Is the knob whore out?

I do appreciate any and all help that this community is willing to give.

Thank you in advance.
Pyropainter

[forrie]

I think the adjustment of z is supposed to work that way. Turn the dial fast and it skips ahead. Turn it slow and deliberately, and it moves in single increments.