I was also having a problem with Pandora not loading when I started my Mazda (i have a Samsung S7) this is what worked for me. I started my Pandora app on my phone, in the top left you will see 3 lines, tap on it, go to settings, look for Advanced, tap Advanced, to to Bluetooth Devices, check Launch from car, bingo, bango, I was back in business. One last thing, after you do all of these steps, restart your phone, good luck