DaVinic Repetier 0.92 Firmware won't move negative on x axis

I'm having problems with my DaVinic printer not moving correctly on the x axis. I have one of two things happen to me:

When I try to move the print head  (repetier or from the printer) on the x axis it will move it will move correctly is the positive direction, but just make noise (like it's stuck) in the negative direction while changing the coordinates  (repetier and on the LCD).  This is the majority of the time

The other option is that printer will start printing and when it needs to return on the x axis it will not do it fully and ends up printing everything left. This occurred during the 18th hour of a 20 hour print and is when my problems started.

Some other strange things, it will return "home" correctly when I first turn on it, but will not if I move it using either the printer controls or repetier it rams into the back of the printer.

Your help is greatly appreciated.