In my OpenVZ node I have few VPS clients.A One clients VPS load is very high. Please fallow the URL. I informed him in several times to attend that issue. But he is not caring about that. I'm getting lots of complaints from my other clients.
Ideally you should dump all his logs before suspending, and check top outputs, io outputs and figure out what is causing it. Could be a number of issues, most likely something he is running or a new module/plugin he is using on his site. More details would be needed to figure it out but what you need is a system admin to figure out whats going on.