That's been happening for a couple weeks now. Not sure if it's the result of DDOS attacks (these govt servers just get hammered all the time) or some broken/overloaded proxy servers that need replacing. I kind of suspect that the cybersecurity scanning tools (tenable, etc) that are employed constantly are almost acting like DOS attacks with the port scans and the proxy server can't handle all the incoming requests. The repeating pattern of a couple minutes of down time, and then fine for several hours suggests it.