I contacted Fazua too. They were very cooperative. I described the issue on a phone call and finally they offered to remotely connect to my bike via my computer. They checked everything and everything, unfortunately, was ok. No solution, for the moment. The day after I bought a Bianchi Aria e-road (Ebikemotion X35 motor in the rear hub) and traded in my Pinarello. The Bianchi works very well. It is a pity, though, as I liked the Pinarello a lot.