So far I've had 2 major issues with my 9a (bought brand new last year). The first was within a week of buying it, there was an issue with the lock screen timing out too quickly that I couldn't input my PIN. The second was just this weekend. My phone crashed, wouldn't turn on, and after 2 days of attempting to revive it, finally booted...then the kernel crashed 3 times in the span of 1 hour. (still trying to make sense of the logs)
I use the 9a as my daily driver, and have an 8a for work. So far no issues with the 8a (bought the same year)