Mazda 6 2010 Bluetooth Upgrade

Mazda 6
Since buying an iPhone XS my Bluetooth connection constantly loses connection and gains it again. So playback is constantly interrupted or speeds up. The old 6s worked fine in my Mazda 6. My new XS phone worked in a newer Mazda no problem. So I assume I need an upgrade in the car, but can I just upgrade the Bluetooth module or is it the whole stereo? I think I have the GER4669RX.