Have you rules out clouds? Wispy, high altitude, difficult to see at night until they block the light of a star/moon etc..

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I've seen this phenomena with Jupiter and the moon before, but it doesn't describe what I've seen.

Imagine you're looking at an empty point of sky on a clear night. Then a blip of light appears, just for an instant. Now it's gone.

It didn't move across the sky, didn't shine or flash. It just appeared and disappeared.

I have also seen flashes of light on at least two occasions. I don't know what they are. I suppose they could be any number of things. While I have seen a number of phenomenon, most of them I could reproduce with a little bit of money. The flashes would not be impossible but it would cost more money than it's worth to make just one single flash of light at ultra high altitude.

Yeah those are interesting events for sure.

It's possible, but Iridium flares are rather rare these days, with the majority of the original constellation having been deorbitted and replaced by satellites that don't flare. There's usually pretty obvious motion which OP didn't mention.

My honest opinion was an astronomical event, like a nova flash

I've been lucky enough to see one Iridium flare in my life. Def not what I'm describing. But it was cool as hell.

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A rotating satellite will light up then fade out. If you didn't get a good sense of its speed and track, you may not be looking in the right spot to see it re-appear.

I've seen these, though not very recently, bright flashes appearing for a while moving in a trajectory.

I guess they were expired satellites rotating out of control, or maybe some satellites are allowed to spin around for some reason?

Iridium flare? From the satellites? They flash sometimes evidently

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