About two weeks ago I've write post about problem with new clutch that doesn't switch to neutral when needed. First 10 kilometers was perfect and than suddenly on every stop engine switches off.
Major suspect was new clutch but to everyone's surprise he wasn't troublemaker.
On diagnostics system reported various errors, most of them caused by bad wiring but nothing specific. So after detailed inspection and with cooperation with Piaggio experts they finally detected and confirmed problem - latest firmware update. After system reset scooter works fine while in "learning" mode first 5-10 kilometers but whet it switches to full mode ECU doesn't perform how it should. Interestingly, when they replaced spark original NGK Spark plugs with Champion models engine switching off about 50% less but still doesn't work how it should or before update.
Luckily, Piaggo is aware about that strange behavior that affects some ECU's and new version will be available within few days.