2007 Saturn Outlook Everything Issue

I have been having a lot of issues with my wife's Saturn Outlook. It started out with the vehicles losing power, door locks unlocked, all of the dash lights came on, braking was reduced and the vehicle died. Mechanic replaced alternator and vehicle ran fine for a month. Took back to the dealer and had to have battery replaced. Vehicle ran fine for a couple of months and the vehicle started having the traction control light, stabilizer control error, engine light come on and lose power. Engine light said to replace throttle body so it was replaced. Vehicle has been running fine for about two months. This morning the traction control error came on along with stabilizer control and engine light. Vehicle lost power, cruise control will not come on. You can still drive vehicle but transmission does not sound like it is shifting.

Any thoughts on what to fix next???