2003 saab 9-3 turbo vector gearbox acting up again?

So at first she drove fine then dash said gearbox malfunction. Right after that the thing could only use 2nd and 5th gear. They said just a sensor so I brought it in and fixed it... This was line 3 days ago cor drove fine but today I was driving and decided to step on the gas. When I stopped the thing started shifting slowly and acted like it was in neutral going into gear.. It stopped doing it when I shut it off for a few ours but I just got home and was driving fine but like 10 min into my highway run it said gearbox malfunction and only used those 2 gears. I didn't speed and I was going 65 so idk what it's problem is. It only has 90k miles to