Ask HN: Why is Bluetooth so unreliable?
For me, the biggest problem with BT is that BT audio is almost entirely unbuffered.  I wear a set of BT headphones connected to a fitness watch (Polar M600) when running.   When the BT connection from the watch to the headphones is briefly blocked by part of my sweaty body (think arm movements when running), the BT signal is interrupted and the music cuts in and out with every stride.   If BT audio could be buffered for 15-20 seconds, this would not be a problem.