turn car to acc or on position radio works perfectly always. start car and radio might work. when not working the volume is stuck in one place and head unit wont respond to any input (although the display will show the change of volume or eq setting nothing actually happens) but if i turn off unit after making change ,those changes are applied. for example vol level at 20% turn knob to 40% not difference, turn off and on via power button and now volume at 40%. this is and intermittent problem but is becoming more frequent as of late. called dealer they are clueless, told me to bring in for diagnostic code check lol