my server is stopping completely and with the following error which are resolved when it restarts:

Out of memory: kill process 15219 (clamd) score 121 ou sacrifice child 
killed process (clamd) total-vm 440996kb, anon-rss:0KB file-rss:0kb

do not understand what the error is what can be done to solve the problem
It has been suggested procedure:
You may be able to limit the memory usage by editing the script in /etc/init.d/ ClamAV and add ulimit -m amountofram, or upgrade the droplet (or add a swap file) to address this
most have not found ClamAV within /etc/init.d only the clamav-daemon and clamav-freshclam