Sounds like a PITA that takes all the enjoyment out of driving.
I dealt with exactly this on my IX, with constant logging/tuning, grew sick of the car, and sold it. Smart decision and I haven't looked back. If you can't trust something and truly enjoy it, why bother owning it?
With my X I made sure to go the exact opposite way and never have to worry about it so I can focus on having fun and enjoying my car. I have no gauges and my car has remained reliable. I drive it every day and never worry about my fuel, tune, boost, etc. Hell, I've never once even logged my car with the AP. I couldn't tell you what my boost is at on any given day, nor do I care
Different strokes for different folks, I just hope with your next car (or even this one), you can learn from previous mistakes and figure out a way to avoid history from repeating itself.