Anti traction keeps coming on a holden vectra v6 2004 moel zc,dont know why

I dont know why the anti traction comes on and off but if I were not driving on slippery ground i would be sure the wheel bolts are tight and seated properly if they are a tiny bitt loose this could cause the system to think they are slipping. Wheel lugs can look tight but if not at proper torque specs they could loosen up over time. they other thing to check is tire pressure improper or different tire pressure on the same axle will tell the differential there is a difference in the movement of each wheel and could cause this warning to appear.Tire preasure must be checked cold tires with guage do not rely on looks and dont use the tires max. cold psi rating go to the drivers door post usually and see the rear and front psi setting for each vehicle made and keep each tire within 1/2 pound of this psi suggested