read though the forums here tried some of the idels and yet i still am haveing server crashes

the server may run anywhere from and hour to 12 hours but it will crash on map change

if i force a map change useing console changelevel map or via webmod the server crashes most everytime

i get the error "num_for_edict:badpointer

please help

amd 550 mhz
256 ram
windows xp pro