... for about a day.I've filled in the feedback form too.
The only 'help' at the moment is to go into the health app / browse / hearing / headphone audio levels / show all data / EDIT / DELETE ALL.
this gives a reprieve ....
I’ve taken the advice I got here and lowered the volume on my phone by around 20%, and haven’t seen the notification yet. But it’s still not ideal, I really need full volume sometimes.