I have the same problem. I had an F700BT. The AM reception was fine. I returned in to Pioneer because of problems with the IPOD connection. They sent me a different unit and there was almost zero AM reception. I returned it again and was upgraded to a X710BT. I still have no AM reception. WTF?
I find with 3.0 that if I stop at intersection, the nav thinks I am turning and flips the display 90 degrees. Once I get going again, it will flip back 90 degrees to the correct course.
I have the problem with an Ipod Nano and Ipod Touch. I updated the system software and the problem still persists. It's intermittent and disappears if you reboot so I doubt it has anything to do with cables.