FWIW: Apple may have quietly found a cure... I experienced this problem early on and Apple sent me a brand new replacement. Like the first pair, they worked for about a week and then started deteriorating with the same intermittent behaviors. Frustrated, I kept resetting and rebooting until finally they could no longer be reset and my iOS devices no longer even saw them, much less connected to them. The same was true of another generic BT transmitter. I returned them again, expecting a new pair. Instead, they returned the same serial # the same day they received them.
This speed seems to indicate that they knew exactly what was wrong with them, and knew precisely how to fix it. Otherwise, one would expect them to take at least a day or two to make sure that they had actually done so. So far, they are working fine! I wish I knew what they replaced inside, and whether I can now expect them to continue to work reliably. I notice that the version is still 3C16, so I would suspect hardware. Time will tell... and, if not, so will I. 😉 ◄Dave►