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While waiting for a new Bluetooth dongle I messed around with some other equipment. It seems like I can't make a Herman/Kardon Onyx 4 to fail, which is a bit strange. Tried to log it with hcidump and nothing unusual showed up. Logging avdtp gave identical results.
So just to double-check what happen when I attached my Sony headphones I started hcidump and connected the headphone, and started playing a streamed movie. I see the effect of the sound breaking up, but I can't make the connection fail when hcidump is running. Usually it is enough to provoke some glitches in the connection, then delay builds up, and the phone disconnects. When that happen all devices using sound over USB dies. With hcidump running is does not die.
This is really weird, as hcidump should not change the stream in any way.