No worries now.
I had no choice but to let the battery run down completely.
After that, a full recharge and it was back to normal.
If anyone is interested in the error messages, please let me know and I will post it here.
Thanks for your response.
Is that JB HiFi you mentioned ?
Actually, I should have stated right from the beginning that I would like to visit Sydney retailers of portable amps/DAC/preamp, headphones and IEM's.