yeouch. sorry man. I've been running in AKS for 3-4 years now and never had an auto-upgrade come in I wasn't expecting. I have been ontop of alerts and security bulletins though, may have kept me ahead of the curve.
I was once on a nice family holiday and broke my resolve and did a 'quick' check of my email and found a nastygram billing reminder from a provider. On the one hand I was super-lucky I checked my mail when I did, and on the other I didn't get he holiday I needed and was lucky to not spill over and impact my family's happiness around me.