PageRank Changed Again

I'm so confused on this whole google pagerank thing. When I first started my blog, it was ranked a PR3 then it dropped to a PR1. I know why it dropped then. I pretty much quit writing and lost a lot of readers. Anyway, I started writing again and last month got it back up to a PR3. But, I logged on this morning and it is now showing that it's dropped to a PR2. Argh! I've not done anything different so no idea why it dropped. I guess I'll just go with the flow. It would be nice if it would stay at a consistent number, but I don't know how to do that so will just go along for the ride. I just hope it doesn't drop any lower.