Look, if you didn't get it last time we told you, you won't get it this time.

They don't know yet. Any answers you get here will be guesses.

Like the other poster said there's no cause known. All I can think of is something happened so close to an experience (something you can actually recall is a different matter) or perhaps something you've experienced peripherally such as a dream or media.

Or perhaps just something so close to one of those you feel like it's happening in front of you.

Or just a glitch in the brain?

Or perhaps it's the Matrix shrug unsure if that's better or worse.

Or....

WTF is ‘deja vulnerable’?

When history rhymes, your brain locks into the beat.

Its Déjà vu, I've never heard of it being refered to as 'vulnerable'

Not this again

Hot patching the matrix with agents

Didn't you ask this question before?