RA ranks are a rollercoaster

I feel like on a rollercoaster these days. Usually when trying to climb top ranks its extremely hard to improve, and one might be growing 1 rank not faster than once in a couple days. But right now the situation is completely different. There are 4 people with almost equally strong economy and military and ranks are extremely volatile. I was rank 2 one day ago, and now fell down all the way to rank 5. It's hard to maintain a rank, but also very exciting.