I had the 3a for three years, passed it on to my son who used it three more years. Bought a 6 after the 3a, used it for three years and passed it on to my son. I am typing this on my 9a. Never had any issues on any of those phones. Either I have been very lucky or you got two rotten apples.
I have owned 3 pixels.
5a - bricked randomly 8 - screen failed within 6 months 6a - stuck in a bootloop, gave up on fixing it just before the battery issue made headlines
I gave them a fair shake. Never again.
I had the 3a for three years, passed it on to my son who used it three more years. Bought a 6 after the 3a, used it for three years and passed it on to my son. I am typing this on my 9a. Never had any issues on any of those phones. Either I have been very lucky or you got two rotten apples.