Would not cut square

The blade height was 61mm when at the left side and 62 when at the right. This doesn't sound like much but when the blade detects the height of the material at one end for a 0.2mm thick material but then the blade is physically 1mm higher at the other side then the blade won't even touch what you're cutting! Also one of them was a touch off on square when cutting... the right side was about 1mm closer to the front than the left side. I'm cutting full 10x11 material and this would lead to it being about 1-2mm off on the right side. I WISH they had some built in way to make minor adjustments. You can fairly easily fix the different in blade height because each side can move up or down about 1mm by loosening 3 screws (after removing the plastic side covers). The arm not cutting square however has no such easy adjustment. What I ended up doing was removing the same 3 screws you can loosen to move the arm up and down and then drilled out the holes in the metal so it would also allow me to move it left and right just a tiny bit. Now I have both machines working to my satisfaction. With such poor quality control on a basic necessity for proper function I don't understand why there is no way to make these minor adjustments at least at the factory! So if there is any deviation in assembly or part manufacturing there isn't even a way for the factory to adjust these things. It would have been so easy to make the connector plate between the moving mechanism and the upper arm with an easy way to make slight adjustments.
A photo of the 3 screws that can loosen to allow you to move it up or down 1mm however in one of mine I had to remove the other side to make adjustments. Same technique just harder to take a good photo of. I also used E6000 glue after adjusting them so that they wouldn't easily move over time.

HOME cycle not working when turned on

When turned on, the arm should move to the front and then fairly quickly to the back. Once it reaches the back the head moves right, then left and a beep

If the arm immediately starts to slowly move to the back (no forward movement at all) and once it reaches the back it starts bouncing as it continues to try and move backward, it may be the limit switch at the front right of the machine has dust in it.