DLink email support advised that I upgrade again the firmware for the WBR-2310
After upgrading to Firmware 1.05 (not the beta version), the wireless worked for approximately three days straight (about 72 hours). Then it crashed completely. No signal at all. With firmwares 1.04 and 1.03 at least the signal remained on the air - even though connectivity has been lost. As before, a cold power off / power on reboot resumed the signal and connectivity.
From reading these forums on the WBR-2310, it seems that this is a problem-plagued device - be it issues with the firmware or the hardware. I think DLink owes it tho those who purchased this router to post some sort of all-encompassing solution to the loss of wireless service (after all, that is the purpose of the router).
Thanks