Old thread I know but it is the most relavant! I had the cutting dead issue while driving, changed one of the relays ages ago but after a few months was evident it hadn't solved it, eventually it became worse and worse then one day refused to start at all after cutting out on the way to work. Replaced the crank position sensor (the one behind the engine mount / oil filter) and everything worked like a dream, that is until last week. Now the engine dies but a relay clicks and rev clock flickers for a few seconds before eventually dieing. Restarts after a few mins but dies again after only a couple of mins. Let it cool down and will run for a few miles until it warms up again. It's got to be electrical in nature as something is turning off one of the relays hence the clicking for a few seconds before cutting, the clicks correspond to loss of power too ie the engine stutters with the clicks then stops alltogether.
