Lcd screen on Brother pr 600 keeps freezing

Hi,
I have a big problem with mr brother embroidery machine. It keeps freezing and it has got to the point where i cant do any embroidery. Some times it will work and sometimes it wont. It has got to the point where it doesnt really work at all now. What can i do to get it fixed? Im in dire straits. You help would be greatly appreciated. Thanks

The king