Touch screen problem 7" - Android Head-Units

Hi, i have a problem with my unit: JY-UOS03P4 (4GB px5 android 8)
When the unit is long time off, when i turn it on, the touch screen and the physic buttons don't work, only works the steering wheel buttons. For what i have to Reset the unit and loste all the FM frequencies....
Any idea of what i can do?
And some option to keep off the unit when i start the engine of the car and only turn it on when i press the power button?
Sorry for my english.

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