Memcached crashes on ddos?

Question

DDoS Protection

With ddos, memcached loads cpu 100% by 90% -100%, access to sessions is lost.
The rest of the services are doing just fine! the only problem with memcache is that even after ddos ​​it does not stabilize, you have to restart it manually. Of course, you can hang up his control on the supervisord and in the case of such a reboot, but this is not the case since all sessions are lost.
Only sessions are stored in the memcache.
Config:

PORT=0
USER="memcached"
MAXCONN="32768"
CACHESIZE="4096"
OPTIONS="-L -t 8 -a 0766 -s /var/run/memcached/memcached.sock"

Perhaps someone faced such a problem? Very much it would not be desirable to hold sessions in other storage.