One suggestion is to literally remove the motherboard and bake it an oven. They give the temperature and time. This is supposed to repair cold solder joints. Might try this sometime as a last ditch effort. The unit is not worth much in its present state.
Playing the songs off of the iPad at this morning's program worked but not without a hitch. I had a playlist with various marches and other patriotic songs that I had playing in the background before the program began. When the program was to start, I hit the pause icon in that playlist and opened up the one for the America the Beautiful playlist. After the Welcome we play that song. Instead of playing American the Beautiful, it started up on the spot where I had stopped it in the other playlist. I made an apology and started the correct song manually.
When that was finished I paused it and flipped it off the screen. When it came time for the Star Spangled Banner which was in its own playlist, I clicked on it and it started as desired.