yeah thats weird bro. I have been watching it too every day around this time.
Are you sure the server does not do any maintenance tasks at this time of day?
There are of course no cronjobs on my servers. But as servers are virtual, it might be caused by heavy maintenance of *other* machines.
Or perhaps your uplink does?
Uplink works well, I see normal traffic here.
Slush, forgive me for speaking out of line here but isn't it about time you invested in some real dedicated machines for your pool and not cheap VPS solutions?