User warning: Error executing "HeadObject" resulted in a `403 Forbidden` response

Suddenly receiving:

User warning: Error executing "HeadObject" on "http://domain.com/site/publicfiles/styles/thumbnail/s3/2019-01/img-name.jpg"; AWS HTTP error: Client error: `HEAD http://domain.com/site/publicfiles/styles/thumbnail/s3/2019-01/img-name.jpg` resulted in a `403 Forbidden` response (client): 403 Forbidden (Request-ID: 157E47091BDC4F64) - in Twistor\FlysystemStreamWrapper->triggerError() (line 932 of /var/www/html/vendor/twistor/flysystem-stream-wrapper/src/FlysystemStreamWrapper.php)

Image loads properly if copy pasted in browser, any clue as to what's going on?

Drupal core 8.6.7
Flysystem 8.x-1.0
Minio version 2019-01-16T21:44:08Z

"/en/admin/content/media" page is in infinite loading loop