Electrical issues
 

I have a 2006 Cayenne Turbo S with low miles that is doing wierd things. the dash dispay is showing brake light failure intermittently when the lights are fine. The other day it displayed that the air suspension was faulty and needed service.It went away but the brake issue is still there. Yesterday when I started the car the radio and navigation was dead . I turned off the car and it went away and started working fine. The battery is new so that rules it out. any ideas will help. I do have a wrecked turbo s that I can use for spare parts and I may change the computer to see if that fixes it