What is the name of the domain?
brandmauer.at
What is the issue you’re encountering
Getting cloudflare notifications every few minutes
So what is the reason we are got this mail so often?
Quite interesting regarding the frequency 
Are all of them for a single or multiple you’re having in your Cloudflare account?
Might be the connection between Cloudflare and your server detected some issue such as the SSL certificate at your origin host/server for your domain expired, therefrom Cloudflare tries to establish a connection over HTTPS and 443 port, but cannot.
Possibly, switched to Flexible but now having issues such as mixed content errors and cannot determine how to proceed further.
Have you checekd your CF dashboard under the SSL/TLS settings, did it switched to Flexible or not?
May I ask what SSL option have you got selected under the SSL/TLS tab at Cloudflare dashboard for your domain ( Flexible, Full, Full Strict … )?
Before moving to Cloudflare, was your Website working over HTTPS connection?
Best way is to temporary Pause Cloudflare for your site. Wait few minutes. Double-check the origin SSL certificate. Renew it. After the Website works okay over HTTPS, un-pause and all good.
Steps for troubleshooting:
- Use the “Pause Cloudflare on Site” option from the Overview tab for your domain at dash.cloudflare.com .
- The link is in the lower right corner of that page.
- Give it five minutes to take effect, then make sure site is working as expected with HTTPS without any error
- Check with your hosting provider / Plesk panel / cPanel AutoSSL / Let’s Encrypt / ACME / Certbot and manually click to renew it
- Only then, when your website responds over HTTPS, you should un-pause Cloudflare and double-check your SSL/TLS setting to make sure it’s set to Full (Strict).
More about this feature:
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