Scrypt server mining process killed
Have you ever thought of looking through your host's Acceptable Use Policy regarding CPU usage? You're breaking their terms so it's no big surprise that your process keeps getting killed. I'm honestly surprised that you haven't been suspended yet for it. To quote:

CPU Usage
Every vps comes with a number of CPU cores that client has access to. The said CPU cores are not dedicated to any vps. Client may not use more than 85% of one CPU core per process thread for more than 10 minutes. Client may not use 100% of one CPU core for more than 2 minutes. When CPU abuse is detected by our automatic programs, process will be killed and/or vps stopped/suspended, and the above Resource Abuse policy will be enforced. 

Find a host that allows cryptocurrency mining, or even better- rent a dedicated server.