I've never had this problem until today, but I've mentioned it a few times over the past couple of weeks in my post and wanted to clarify.
I had originally heard that you could only cash out 5 times per month at Swagbucks, but I couldn't find it anywhere in the Rules or TOS(talk about some dry reading...). Anyway, as it turns out, you can only cash out for the same prize 5 times per month.
For example, I always cash out for the $5 Amazon card. I don't like waiting for the huge Swagbucks required for the $25 cashouts and I love being able to add the amount to my Amazon account balance fairly often.
This month, by a miracle of all miracles, I've managed to make it to 450 Swagbucks and I've already cashed out for 5 $5 Amazon cards this month. That's unprecedented and I'm thrilled, but I can't cash out for that next $5 Amazon card until the first of the month. I'm not worried about that though, I'll just keep earning towards my next one.
Just thought I would clarify in case anyone else has an awesome Swagbucks month. You can only cash out for 5 of the same prize per calendar month.
For the first time in a long time, I can't wait until the beginning of the month!