The problem, which was first reported to me by readers, manifests itself as periodic disconnections. Sometimes the headphones will reconnect, other times the problem requires Bluetooth to be switched off and on, and at its worst, it requires a reboot of the iPhone. Popular now: I hadn't suffered from this issue initially, but had mostly been using my pair of AirPods Pro. On testing with other headphones, I noticed the problem -- periodic dropping of the connection for no obvious reason. I tried all the usual things -- reconnecting the headphones, switching Bluetooth off and on, and rebooting the iPhone -- and that worked, but only temporarily. The problem would return, with no obvious cause.