i am surprised you have not heard from others ... given i thought there was many like you & i that have the " issue".
have you updated to vers 1.1 of the a320/1 yet ... i was wondering if inadvertently / accidently there was a solution therein / it has disappeared !
i will be updating soon, just haven't had the time !!
having simmed other complex aircraft on the same pc / same add-ons including the axe, i find it hard to believe it's not a "stress glitch" in the a320/1 somehow (as you have possibly identified).