Dear Steve

The Comms Errors here were tracked down to un-plugging the USB memory stick (used for transferring part files from office to workshop) without using 'safely remove hardware' function.

The comms error would manifest itself in many guises from just stopping, resetting or crashing. Usually withing a few minutes of 'pulling' the memory stick but once it was hours later.

Anyway thats my two penn'orth.
Sincerely and in good faith
Martin Reid

PS I'll keep watching with interest. Please post when you have it sorted.