TahatiStorm

Just got my girl last week. The test drive was great and everything checked out great. Well 4 days after bringing it home I get a traction message, low tire message and a stability message. On top of that the worst thing happens. While Driving my SUV automatically shifts into 4 wheel drive. It's gotten so bad that when it shifts from 2 wheel to 4. It literally stops the truck in the middle of the road before proceeding on. My mechanic next door says it's a computer problem. I know that's gonna cost me and arm and some a**.
Anyone else going through this or has gone through this and found the solution. Cause right now all I'm thinking about about is how f'ed up the transmission is gonna be if it continues.