As a premise, I am the only person in the company who knows how to use a new Technology, and there are only a handful people in the whole country who use it. The Technology is in a very early phase, with minimal documentation and almost zero support from the company that created and maintains it. The only reason our company uses it is because we want to be a pioneer and leader in the industry of the Technology users. And the nature of our work means that we must "test-as-we-go", i.e. there is no way to test this technology except by using it in direct action with the business' core operations.
Working with this Technology makes up ~10% of my overall role and I work directly with the CEO on it (though he is not my actual line manager). There are many times where the Technology doesn't work as expected. In one serious case it just stopped working altogether during a business critical time, with no explanation from the providing company, and while everyone at the providing company was on holiday.
With a furious and ranting CEO next to me, I was trying every possible action, hack or trick to make it work again but to no avail, while also holding off on the remaining 90% of my regular work. He didn't insult me directly, but the way he spoke he was insinuating that I was the one who screwed up. Even worse, we managed to get hold of one of the few experts out there (who has five years experience, vs me just one) who repeated one of the solutions I tried following my same steps and all of a sudden it started working again. This triggered many questions by him as to how this was possible, how come I had not been able, etc. My best guess is that it was just a random downtime, at the wrong time.
I am generally very attentive and think of every possibility, but there is a huge degree of unreliability and unexpected changes like the incident described above.
How can I make this clear to the CEO and anyone in the company who tries to point fingers at me or uses pressure words to try and squeeze out work from me?
P.S.: I cannot reveal more than what I described here about the exact nature of the technology, for security and legal reasons.