TUNAI Firefly LDAC Bluetooth Receiver: High Resolution Wireless Audio Bluetooth 5.0 Adapter with Audiophile USB DAC 3.5mm AUX for Car/Home Stereo Hi Res Music Streaming; Auto On, No Charging Needed

We had a 2013 500 Sport and had the same issue. iPhone 11 would never connect reliably. We ended up getting this Bluetooth auxiliary device which solved the problem, nicely. https://www.amazon.com/dp/B01HDO66NK