Server FPS Problem

[Schiaffino]

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Server OS: Specific version. Windows Server 2008 64-bit
Ram: 4 gb ram
Game(s): Garrysmod
Gamemode: DarkRP
Admin Mods: ULX, Ulib, Sourcemod, MetaMod
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Hello guys, well for some reason when the server is online for a few hours from 1 second to another without a normal reason xD the server FPS get down to "2" ! yes 2 FPS and people start lagging as hell. Do you know how i can avoid this situation guys ?

Thanks for your time, and thanks for your attempt of understanding my weird spelling <3

[blaquicat]

The Server goes to 2 fps? Thats weird..
Try that:
sm_cvar fps_max 500