Many thanks for any help.
Era 100 which has been functioning well has suddenly started with an error which I can’t find described in the help pages.
The speaker actually still works, but whenever it is plugged in has random runs of rapid chimes/noises associated with rapid flashing green and orange (and sometimes red) lights.
There is no pattern to when the runs happen but it is every couple of minutes at most. There is no pattern to the length of the runs of chimes/lights and this varies quite wildly.
The flashes and sounds are rapid, several per second.
Have had to unplug the speaker rather than listen to it 24/7!
It has not responded to resetting the router, several power cycles including one lasting a couple of days, a full factory reset and update of the speaker, and the advice on how to bring a device out of diagnostic mode.
Has anyone had a similar error or come across this error described anywhere?