I have IS350 2008 with NAV and Mark Levinson System.
I think the problem started few weeks ago, the ignition was not normal, early in the morning I have to start the car twice, later on the day it is normal. Some times, the speakers make very load sound, like a loud whistle but then all start normal. Yesterday, the battery was dead so I said, then that is the issue with ignition, and yes I replaced the battery and the ignition went back to normal, quick and once to start the car.
Today morning, I started the car, then the same load whistle sound came out followed with a pop up sound, car started normally but no sound at all, not even the buttons sound, both soft and hard buttons, though still working fine, and I cannot control volume!
I tried to switch car off and on but still the same, so I tried accessories only, and without ignition I have sound, I start the car, the same issue, loud noises and then silent!

Any one have an idea what would be the problem, I know my sound system is fine but something at ignition disable it.

Thanks in advance.