Hi there!
Those two alerts are fairly common notifications for web apps. They aren't your root cause for your issue however.
If you go to your Web App resource > Diagnose and solve problems > 'Application Logs' and 'Web App Down' under the 'Availability and Performance' category. These two categories should help show you the relevant logs on why your web app is not loading properly.
Hope this helps. Drop a comment if you need further help, otherwise if this helps you find the root cause for your fix then mark as accepted.