Initially, the display would blank out if the car was in the sun too long in the summer, now in the winter, it keeps turning off automatically while I'm driving. Is there an internal battery that needs replacing? How much approx to fix?

Thanks.

 

The stock unit sucked the first one i had the volume did not work then the 2nd the buttons got stock finally i got another and used it for a week and put a aftermarket one in..I will cost more for a stock one..why not get a better one