Arduino Leonardo problems

Hello.

I have build an arduino uno device for simhub.

An i2c screen for different information during the game, rgb matrix, rpm leds, buttons for move screens and dashes and one encoder.

I have problems moving to arduino leonardo..i cant upload from simhub, because cant find a port during compiling (he disconnect the port for upload).

I can upload the sketch from the ide but only pressing the reset button and selecting the com port for arduino leonardo (not for the gamepaddevice)

But the i2cscreen doesnt work, the rpm leds doesnt work..the connection to simhub its a mess, sometimes connect and sometimes dont