SSL Protocol error on all site this morning across 3 different sites

Hi My website URL is:
www.rachelsbabymassage.com;
www.rachelsbabymassage.co.uk;
www.rachelsreflex.co.uk

As of this morning, all attempts to access any of these sites via SSL, whether the main page via https:// or via tne wp-admin console result gin the current error message:

This site can’t provide a secure connection
ERR_SSL_PROTOCOL_ERROR

ie navigating to https://rachelsbabymassage.com, or rachelsbabymassage.com/wp-admin

This was not an issue for any of these sites 4 days ago (weekend) when we last looked at them.

www.rachelsbabymassage.com has sectigo/Commodo DV certificate, installed several weeks ago, which as worked fine until checking this morning.

The other sites (www.rachelsbabymassage.co.,uk anbd rachelsreflex.co.uk use self signed certificates - again these have worked without issue for several months.

Grateful for you help as appears to have happened this morning and is applying to all 3 sites - my feeling this is something underlying?
As it stands, cannot even get into wordpress admin wp-admin page

Thank you

OK- looks like a similar issue to what others have reported here: Err_ssl_protocol_error - #3 by staniscp

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