This is interesting..
I have had my MTW for 18 months and it has always started on the button.
I went for a drive last week and got caught in a terrible traffic jam, the engine went into skip fire mode and eventually the engine warning light came on. Fortunately the dual carriageway had a wide central reservation so I was able to sit it out for an hour or so. Note to self; fit urban cooling fan that I bought 6 months ago.
I have kept it on trickle charge as I do normally but on Saturday It wouldn't start. It had fuel at the injectors and a spark at the plugs. I had read about the cutoff button so gave it a press, this didn't work until I held it down an tried to start it again, whereupon a large flash occurred from between cylinders and it started. It has been fine since, hope this helps.