Gmod, Ragdolls Disappear Randomly After A Minute

I try to pose ragdolls and they just disappear. It’s not like their invisible and I can just undo and try again, NO, it just takes the ragdoll away from the game and I can’t undo it, and once I spawn a new one in, it just disappears again.

Do they change colour before they disappear?

My friend had similar problem, but his ragdoll became pinkish before they disappear.

Any console errors?

Help me please

[editline]29th June 2014[/editline]

No consol errors and I reinstalled gmod and nothing my dad bought me this for a present and now it don’t work? HELP!!!