www subdomain redirect stopped working after a while

Since yesterday I have pointed a custom domain to my CF pages via the automatically added CNAME pointing to the apex. Then I first tried to add the www subdomain as another custom domain which worked for an hour and then returned 503 again. Afterwards I removed the www subdomain again and tried to add a bulk redirect which never worked. In the end I added a page rule to redirect which worked immediately but then also stopped working after some time and I get again 503s. My account id: fde4ca60cb752b518e901a4c89f0225e