Yep. the 3rd was a bit higher than usual, the 4th was over double what I usually get, the 5th went back to just a bit more than I usually get... and today is back up to over double what I usually get. While the fluctuations shouldn't be related, the larger amounts might be related to the email they sent out a few weeks back with regards to how they're changing the way they handle payouts for authors. I've had big drops before and big increases and then they just gradually head back to the average over the rest of the month... never had it going massively up, down and then back up again!