@ jithinjohny

There are many reasons for packets loss

* Overload on the servers service ( Apache , Nginx , Litespeed) In your case it apache
* 503 Errors occur when there is too many traffic on the servers .
* There also would be DDOS attacks on the server , resulting in packets loss.
* If the Hosting provider is overselling his server resource . Can also cause this issue.

Your Hosting provider needs to investigate regarding this.