I have a CPanel server with 5 IPs and a few domains.

During night, access to main domain through HTTP return 324 no response many times. After several refresh it comes but many assets won't load and return 324. Using HTTPS is fine. During day HTTP is also fine.

But another domain on that very sever works fine all the day through HTTP.

The server DNS are ns1 and ns2 of the first domain. Second domain is on the shared IP and first domain has a dedicated IP.

I cant resolve the problem :( and appreciate any help so much!