hi @anonymouse
this happened to me recently while on a multi-day tour in Ireland, couldn't figure out why.
On one of the occasions I pressed the volume button on my headset, just a quick tap, and this resolved it, I did not actually turn the volume up just a tap. No idea why, but it worked and I used it from that point on.
this is not ideal, but it may be a long time until the next instruction.
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