Domain mapping not anymore working

Hi,
Last time I tried to map as usual, i get infinitly the message "Domain name is unavailable to access. .... check your DNS records are configured correctly."
Of course I have checked the DNS there is more than 200 domains mapped with success until now and this now appears without any reason ! I have tried to avoid verification but nothing changed.
Thanks for your support
Frederique

edit : I have unchecked both "Verify domain's DNS settings"
and "domain propagation before mapping"
and it works even qualifying "invalid" in health status.
Still abnormal.