This is also happening to me. Been driving me nuts since I upgraded to beta 2. Happens when phone is wired to car and also when using BT. Pauses at least every 3-4 minutes. Never experienced this with beta 1.
Same here. Thought is was a BT problem, so I drove an hour to the Apple Store today for some dongles and same problem. Also happening when just playing through the iPhone 7+ speakers.