Here is the result of the support ticket I had with them explaining that the traffic was not an attack and is expected to spike from time to time. Edited only to remove their upsell links.
"After looking into the matter, it would seem that our VPS do not have a profile that would accomodate your traffic spikes. However should you switch to a dedicated server, we would be able to apply a a custom profile to your server that we better suit your needs.
Our Kimsufi server are extremely affordable and do not cost much more then what you are presently paying. However they do have limitation, among other things, you cannot order additional IPs on the server. I would advise you to think carefully before purchasing such a server.
Another alternative would be to move to our mid range server, our Soyoustart servers, which offer many of the same benefits as our OVH dedicated servers, however at a very competitive price."
