DVD service getting throttled?

The day after I put a movie in a mail, I was getting dvds immediately dispatched from netflix, so that I could get 2 waves in a week. Now, they seem to be waiting for mine to return for them to send the new ones out, which take 2-3 days each way. Am I being throttled here?

I always make sure to have the barcode visible in the window, but I have been going through dvds relatively quickly. I only keep dvds for a day, they always go out the next business day.