This doesn't exactly match the subject line, but I sure know what DIR-655 lockup is! I am on my third D-Link DIR-655 via the RMA process. This one arrived the middle of July, 2009. It worked fine until August 10th. It locked up and I noticed the Status LED was on solid - not blinking as it is supposed to. A power of and back on got it going. It locked up again this morning - Aug 15, 2009 with the same indications. I called D-Link to report the problem. They were going to send me router #4, but thought better of it. Now I have to call their super duper specialist on Monday to find out what they're going to do. The router arrived with hardware version A4 and firmware version 1.21. I did not change anything, just loaded my saved configuration and let it run. This is supposed to be a great router. I like the features but I am glad I have a Belkin router as a backup!