This has happened twice. Re set tyre pressure and the stop/start worked for a short time and then stopped. Took it in to the local dealer and they could not find anything wrong but re set the tyre pressure as that appeared to show up a problem on their diagnostics. Not had to change pressures for some time but when I did, it happened again. Just re-set the tyre pressures and the stop start is working again. Strange but true. Has anyone else come across this?