Anyone else having a Bluetooth headset issue since yesterdays MarshMallow update?

[AC Question]

I have two Motorola H730 headsets, one I have been using forever and a backup that was never paired before. Both now beep every 20 seconds when connected to the phone (Nexus 6P). I have unpaired and re-paired the headsets, factory reset the headsets, rebooted the phone... gone through all the normal steps I can think of. No change. I have not noticed this beep when connected to the car. As I said this behavior showed up after the update to 6.0.1. I suspect a notification setting somewhere but have not found it yet. Any other ideas?

Thanks,
Rick