I bought the XL LCD panel, printed an enclosure for it and have it running my prints off the SDcard. Worked fine for a few weeks but now it seems on a medium to long print, the letters on the screen go haywire ? Sometimes the print finishes fine but sometimes it fails. I checked and all connections seem tight and correct. I asked my vendor and he said he has heard of this but offered no solutions. Has anyone seen this and is there a solution?