There might be a bad sensor, somewhere...the dealership guys need to re-check what systems are involved in SRS, check all connectors for looseness/contamination/water etc. Moisture can play hell with car electrical systems, especially new ones that of late now include onboard hot-tubs, microwaves, and refrigerators or whatever other stupid accessories they're adding nowadays to sell cars...have em check the wiring for chafing etc...cars shake when they go down the road, because of the wheels, because of the road, because of the engine, whatever...if there's a bare spot on the insulation anywhere, it can cause part of the electrical system to ground out, and that can make the rest of the system do wierd stuff....