I have been experiencing an unusual problem with my 2005 Lexus GX 470. The Engine check; VSC TRAC, KDSS, RSCA OFF lights come ON, especially after the car has been parked for a while. The Lexus dealer has checked and reset the lights on three occasions and found no problem with any of the systems. What could be the source of this problem? has anyone ever experienced this problem before? I love my GX but this is driving me nuts. Help!!!!