I am having the same issue with Rev B 2.00NA. Bought it about a month ago (for my mom) and it stops broadcasting a night, every night. Have tried different settings -- single channel, 20mhz only, wpa with tkip, etc. Many suggestions have been made with no success.
Went to officemax today and saw the new version -- Rev B. But the firmware version on the box said 2.02NA. Officemax had some boxes with 2.00NA. Is there a new firmware version out there for this router? I cannot find it on the website.
I have an older d-link 655 -- A3 with f/w 1.11 and have never had a problem with it. I have had it for over 2 years now.
I hope D-Link is listening, b/c they are about to lose a dedicated customer.