Shifter problem and loss of power in high revs GSXR 1000 R 2020

Hello everybody,
Sorry for my bad English, I am French,
I have a problem with my GSXR 1000 R 2020. My shifter don't work any more and I lose power in high revs.
I changed for another oem quickshiter, always the same problem.
I changed the ECU, always the same problem.
I changed the fuel pump, always the same problem.

Someone already had this problem.
I think I have a problem with a speed sensor or another sensor.

Thank you for your help

Gerard