This happens to me too. It's Law of Attraction. When you are giving your attention to something, you experience instances of it all the time. Imagine if you bought a certain make of car. Suddenly you notice them constantly. It's like everyone bought that same car.
I notice when I am reading and the TV is on, I'll read a word at the exact same time as someone on TV says it. And my partner will mention something while watching a soccer game (or whatever) and a moment later the commentator will repeat his very words.
The feeling that you get about having experienced a situation before is deja vu. No-one can explain it properly.