My Bose A-20s are in the back of a UPS airplane right now headed over to Massachusetts.
Over the last week they developed a nasty habit of cutting out all sound for a few seconds if I moved my head ....sometimes. A few seconds of no communication is very bad especially in the terminal environment. I did find it only happened when ANR was turned on. So my temporary fix was to sit REALLY still in cruise. Once below 18,000 feet I just turned the ANR off and dealt with the extra noise.
There is a 5 year warranty so back they went. I am pretty sure it's an issue with the cable.
Today I had to use the company supplied David Clamps...err David Clarks. Wow I forgot how heavy and clamping they are. Ugh.
Thankfully I have one trip tomorrow and then I am off for 10 days...I should have my Bose back before my next long trip. I hope so anyway.