I noticed strange price fluctation pattern in the last couple of months. Price suddenly goes up for about 200 USD simultaneously on all major exchanges with a lot of volume. Then after a few days price props suddenly for about the same amount and again on all exchanges with big volumes.

Could it be that the exchanges coordinate actions and push the price up and down as they wish and on each cycle of this pattern?

It is possible that exchages buy coins on some volume and then buy back but on lower price but at much bigger volume and make a lot of money on this?

if that is the case price will continue to go down because more coinss are sold than bought.