I have been experiencing exactly the same thing. I run 5 WordPress sites on the same server, but suddenly started getting ERR_TOO_MANY_REDIRECTS when I try to access wp-admin on one of them (the others are fine). If I delete .htaccess entirely in that domain’s subdirectory I can access the admin panel again, similarly if I delete the WordPress code from the top of the .htaccess file (although then I lose the redirects for pretty permalinks).
Having consulted with my host, they advised me that it may be an issue with using SSL and Cloudflare. Once I disabled Cloudflare everything returned to normal. I have now changed the Cloudflare SSL support to ‘Full Strict’ and am waiting for it top propagate.
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