AWD not working correctly

ok, i need help,,,,it looks like the svx isnt AWD now!! and its snowing!! for some reason there is a delay before the back wheels turn, and when they finally do, its only for a second,,,,what do i do?!! does it need to warm up more or something??if its something major...looks like there will be an svx for sale soon!! someone help me, i dont wanna sell it!!