Happens every hour of play.. very annoying and does it to everyone on the server at the same time.

[Warn] [FML]: Quark loaded a new chunk [-4, -5] in dimension 0 (overworld) while populating chunk [-5, -5], causing cascading worldgen lag..
09:01:45 [Warn] [FML]: Please report this to the mod's issue tracker. This log can be disabled in the Forge config..
09:07:39 [Warn] [MinecraftServer]: Can't keep up! Did the system time change, or is the server overloaded? Running 2163ms behind, skipping 43 tick(s).
09:24:52 [Warn] [MinecraftServer]: Can't keep up! Did the system time change, or is the server overloaded? Running 30951ms behind, skipping 619 tick(s).

I saw another post on this and you said it wasn't on your end.. well it must be, because it's a problem. It's quite annoying getting disconnected every hour because of this.

There's no reason this would kick you out.