Multisite subdomains install redirect loop to /wp-signup.php?new=

I have read through at least 10 threads with similar problem being stated, but none of the proposed resolves seem to be working for me.

Here is the deal …

Multisite with subdomain install. The base site is https://capperwebsites.com. I am using a wildcard to map some of my domains such as say https://capperads.com (capperads.capperwebsites.com), while other subdomains are just as is (framed.capperwebsites.com). Everything had been working perfectly until 3 days ago and all of a sudden all my sites started fetching this redirect loop to capperwebsites.com/wp-signup.php?new=.

I set up the install without www. and am fairly certain www. redirects to plan https://. That has never been an issue.

My host felt it was a db issue, so I restored to previous working version with no luck. I have altered my wp-config with various suggestions read in earlier posts, but no luck. Here is my config …

define('WP_DEBUG', false);

// define('ADMIN_COOKIE_PATH', '/');
//  define('COOKIEPATH', '');
//  define('SITECOOKIEPATH', '');

/* That's all, stop editing! Happy blogging. */

define( 'MULTISITE', true );
define( 'SUBDOMAIN_INSTALL', true );
$base = '/';
define( 'DOMAIN_CURRENT_SITE', 'capperwebsites.com' );
define( 'PATH_CURRENT_SITE', '/' );
define( 'SITE_ID_CURRENT_SITE', 1 );
define( 'BLOG_ID_CURRENT_SITE', 1 );

I am not a coder per say, but have always known enough to get myself out of previous jams, but this one is beyond me. I am totally confused, frustrated and worn out. Help!

Thanks in advance!