Car Bluetooth question

I brought my car (2013 Hyundai Sonata) in for service and they updated the computer system. Since then, my phone (iPhone 7) will not hold a connection via Bluetooth. It connects for about 5 seconds then disconnects. Which I find strange since it worked perfectly before the update. I've tried everything on my phone and in my car, such as "forget this phone" and reconnect it, to resolve the issue but nothing has work. I brought my car back to Hyundai and they basically told me they can't do anything about it. Has anyone else ever experienced this problem?