I have dejavu at certain time intervals (such as once a month). It's been a familiar feeling for a long time. I never liked the feeling.
It's like a momentary emptiness. When I experience dejavu, I pray immediately. I get the feeling I have to protect myself. I guess sometimes I'm successful. I usually have a problem after I have déjà vu. It's like a game about one's sensims.
Me or someone I love is definitely creating a crisis. This is usually about material or spiritual issues that can affect you greatly. It's almost like your patience is being measured.
The C's have said that deja vu comes courtesy of 4D STS. So what you're writing may be indicative of that - a sense of deja vu, then problems.
When you say you guess you're sometimes successful in protecting yourself with prayer, can you be more specific about that? What does a successful prayer, or successful protection look like? How do you judge it, and how do you know? I bring up the question of judgment, knowing (and thus, Knowledge) because although the C's have spoken about prayer protecting, they have emphasized much more strongly that Knowledge Protects.