I’m yet to experience it but I’m interested to find out what you think the reason was in your case. I was kind of under impression that the more deep dives you log, statistically you’re gonna get narked sooner or later even if you always dive by the book. If there is a silver bullet out there, how to never get narked with multiple deep dives over the years, I’d like to know what it is.
Funny, I goofed up on my AOW Deep dive too. I’ve been cold water diving in full 7mm and it always felt warm enough, sometimes too warm. Well, for my deep dive I took off the hood and gloves, wanted to try what it’s like. Duh! Got the worst ice-cream headache of my life.