Error 999?

This has happened a lot recently. I'll click "submit" to an answer and I'll get the message below. Then it wont let me answer any more questions, I'll get the same error. I've tried signing out and back in. I've tried restarting my computer. What's going on?

Sorry, Unable to process request at this time -- error 999.

Yahoo!

Unfortunately we are unable to process your request at this time. This error is usually temporary. Please try again later.

If you continue to experience this error, it may be caused by one of the following:

* You may want to scan your system for spyware and viruses, as they may interfere with your ability to connect to Yahoo!. For detailed information on spyware and virus protection, please visit the Yahoo! Security Center.

* This problem may be due to unusual network activity coming from your Internet Service Provider. We recommend that you report this problem to them.

Error 999?viruses

This error appears to be a "catch-all" error code that Yahoo serves up when it doesn't have a more specific error code. It essentially means "Oops! Something went wrong but we don't know what, so we'll just say that Error 999 occurred."

The most common reason for receiving Yahoo Error 999 is due to some sort of bandwidth limiting system that Yahoo has put in place on their servers. Once you have exceeded your allotted bandwidth for a specific period of time Yahoo gives you this Error 999 message and doesn't allow you to access the service. People have primarily reported receiving this error when they try to access Yahoo Mail or Yahoo Groups, but other Yahoo services may also be affected.