Is the server unstable?

[MrGoober]

Its the server taking its daily nap. It runs 23hrs and 55 minutes, it needs a rest sometime! Poor server it's worked too hard.

On a serious note. Maybe its the server restarting?

If that's the case it's a crappy server or setup. It should be set in dual or tri servers in mirror raid. so server 1 goes down & updates while 2&/or 3 pick up the load, 1 restarting and ppl updating, 2 following 1 & so on.
Mutual update is better when all shut down & update.
Ever notice there are A LOT of cs zones running? Maxxing out @ 23 occupancy? This cuts down on bandwidth latency per zone which enhances (ping) performance.