I have a 99 Suburban 3/4 ton 2wd. A couple of weeks ago I pulled into the driveway, got out and shut the door, and the doors locked by themselves. When I got back in the the radio was locked. I got the code and unlocked the radio. It's been fine until a couple days ago when my wife was driving it and it shut off. It started right back up, everything seemed fine including the radio, she drove to her destination and called me. I went to pick it up and when I got in the radio was locked again. I found some corroded terminals...battery cable, terminal block on the fan shroud, I cleaned them up but could that be it? Computer? Any ideas???