Never had any issues with any Zenfone. I had Zenfone 2 (5 years and it's still working, but I'm not the owner anymore), Zenfone 3 (3 years and it's still working without issues, my cousin is using it now), Zenfone 5z which I used for 1 year and a bit...
Yet, after all this talking, we still don't have an answer to the question. What is AI Boost supposed to do? I didn't notice a difference on Zenfone 5z and neither on my new Zenfone 6.There was indeed a difference (at least in benchmarks) on Android ...