3D printing error

[limpet]

Has anyone had the following error (on Up Plus)

At some random point during the print it just stops stationary, with Printing System Error Layer 51 (or possibly some other number aswell)
I`ve had it a several different prints now but the current two hour job has done it twice, at about 30 minutes and again at about 1hr 20.
I have now cleaned up the stl file as much as I can see and reduced some of the finer unneeded details, although I don`t think its related to that, and I`m just about to try another print.

[limpet]

Update: after cleaning up the stl file and arranging the job at 90 degrees to the print bed it has just printed without a hitch in 2 hours 5 minutes.
Limpet XXT is one step closer to finishing