Text size limit

Greetings I'm doing some scale testing and I've noticed that I can't programmatically upload data to a textarea using REST if the data is longer than 2100 characters (approximately). This is the error I get The remote server returned an error: (500) Internal Server Error. The textarea should hold 4000 characters. Interestingly this also doesn't work via the UI. Here is the error I get Unexpexted Error. Our technical staff has been notified and will look into the problem. We apologize for any inconvenience this may have caused you. Help Jim