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Again, probably not what you want to hear but I have a 20’ Polo and a 20’ Golf and the IPhone 7 & 8 Plus, 11 pro max and 12 pro max have all worked fine without cutting out, tested over several 15/20 minute journeys.

Andy Beats wrote: ↑Thu Sep 16, 2021 10:46 am Not what you want to hear, but no issues with iphone XR or iphone 12 in our Polo 'United'
Surely the evidence is that it's your USB socket or head unit that has a problem?
You can't be that unlucky that you've twice chosen specific iphone models that are a problem.

The evidence suggests it’s the car hardware or software, which is what I said earlier. I will try and get a firmware update at the next service. The car is out of warranty and a repair could be costly.

The Bluetooth volume was just a setting on the car ICE unit. Odd how it had changed.