you mite have water in your alarm that might be setting it off
if you can find it try to see if there is any water around the box, or along the wires running to the box. i had this prolem with my old escort, the alarm had water in it, was driving down the road then the car cut out.
as for the steering i dont know unless some thing has given way or been hit of a bump or some thing.
hope this helps you out