Thank you for your reply.
I still have a Nissin 866 for Canon, that on the used market has the value of a coffee. I no more shoot on live events, and don't really use the flash anymore...despite this i think a 60 guide number with 2 lamps flash is worth a 15€ manual trigger on amazon, for maybe...some still shots at home?
The small useless flash bundled with the camera works fine, so if you have some useful advice or if you are aware of any known problem i'm listening.
It's sad that the first answer I receive from the first post of this forum is full of irony and poor in content, waiting for better answers I will continue to investigate the problem. Anyway thank you for your time!