Eero blocking access to secure sites

Hello, suddenly I am unable to access certain websites on my network (they have been fine for the last 3 months). The internet works fine otherwise. It just seems to be secure sites https and not others. I do not have eero secure in place and the sites are blocked on all devices. I can access them fine if I use my 4G internet to connect and not my eero network. I have called my broadband supplier and they say there is nothing blocking it from their end. There are no error messages on the eero app. I get the following error when I access some secure sites: ERR_TOO_MANY_REDIRECTS

Can anyone help me please?