These are unrelated issues. The signing in multiple times thing has to do with how the platform handles cookies for webapps that run on a domain different form ArcGIS. I'm hoping we get a solve for this into the next release of ArcGIS Online. There is a setting for Hub Premium that alleviates this issue significantly but as of this time it's not yet available to all base ArcGIS online orgs. I'm hoping to get that updated.
(If you are on Hub premium and activated Hub after March, 2019 then the setting is set automatically. If you activated before March 2019 then please visit the Community -> Admin tab to enable this setting).