I have had persistent bluetooth issues since the iPhone 12 Pro and now the same with the iPhone 13 Pro for phone calls. My airpot pros, and both my Audi handsfree connections seem to be affected. I have worked with apple support, changed the phone, AirPods, updated Audi software, removed added all Bluetooth devices, and even started my most recent phone as new with no backup. Multiple iOS updates over the past year have not helped either. On calls when there is poorer signal the bluetooth connection starts cutting out such that I hear every other word and the same on receiver side. I switch to speaker and all of this distortion disappears. If I immediately connect back to the Bluetooth device, the distortion resumes. After a little time, when I reconnect it seems to resolve. This is very frustrating and can happen multiple times in my car. I have noticed it is much worse in my car when driving so I wonder if it related to the ATT signal, 5g, etc. I am very frustrated at this point and don't know how to actually use my phone in a proper way. Using the Bluetooth has allowed me to be safer when driving, traveling etc. Sometimes I miss my Nokia, the calls were never an issue