Last night got an update to ios 13.2.3 on my iphone XS Max, this morning the bluetooth can no longer working together with the ACP. I either have bluetooth connected or plug-in ACP. Try few times to remove and pair again, same thing happen! for now, I just leave it ACP with no pair with bluetooth. will see hows thing goes. BTW, I also had the new HU update early this week. This may cause by both HU and ios update together! That sucks anyway!