Having a problem with the USB keeping my old iPod 80 gig classic juiced and charged. It works great and then runs low on power and stops working. Then I have to plug it into the 12v car charger receptacle to charge it. Then I can upplug it and plug it back into the USB and it works great until it runs out of juice again... Frustrating. I have not updated the iPod's operating system in years and will try a different cable and maybe that is it. Frustrating. Anyone have any ideas? Do I need to take my 2018 STX in and have them take a look at it? I have the big display Sync or Sync3?