Audio devices keep resetting

For the last couple of weeks my audio devices have started resetting back to their original values, usually after a reboot. I have 5.1 speakers and some headphones always plugged in and whenever I try and play anything the audio is always set to the headphones (not the last used device) and instead of 5.1 the speakers are always set back to stereo, so every time I try and play anything I have to re-configure the audio. Is there any way to get it to remember my choices? It always remembers the volume levels and other options, just not the 5.1 / stereo device configuration.

Thanks for your help.

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I have exactly the same setup and problem.