I'm having the same issue (as well as a similar issue where the printer detects an endstop has been hit when it clearly hasn't)
Where did you get the latest firmware?
End Stop Issues
Re: End Stop Issues
the latest firmware is here:
http://www.geeetech.com/forum/viewtopic ... 20&t=17046
http://www.geeetech.com/forum/viewtopic ... 20&t=17046