Hi Graeme, i have some chock block connections here so i will give them a try for now and see how i get on. I can see how the current connections are highly protected against a short but im wondering about a break as i highly suspect that brown motor wire was not connected well, and i know that these drivers cannot be hot unplugged without blowing the drivers as there is no protection, and ive heard many stories of people unplugging the cables whils energised and blowing the drivers, i wonder if a poor or nearly broken connection here could intermittently simulate a similar event.