Mine has done this twice since I had it and I dont think its the TB.
Am i right in saying you turn the key, then engine sounds rough and struggles then it says 'engine fault, look at your book'
I think it occurs when the fuel pump doesnt engage properly on startup and usually goes after that... the only reason I say it isnt TB is because it happened directly before a TB clean and happened again this week following a TB clean about a month ago.
My 2 pence
_________________________
Black Mountune ST185
Mountune enclosure and K&N57i
Milltek exhaust system including 4-1 manifold
Piper cams & valve springs
Remap