Well...I know there are a lot of threads out there regarding connection issues, both with wireless & LAN connections, after updating firmware to 1.35. To provide a snapshot of my setup...I have 3 GB switches throughout my home, a couple Ethernet enabled Blu-Ray players, 2 XBOX 360's, multiple satellite receivers with Ethernet, 5 PC's, 3 iphones, etc...you get the picture. I also have 5 older DLink wi-fi cameras. So, with this said my setup has been flawless for some time. However, a week or so ago I upgraded my firmware on my DIR-655 to the latest version...everything still seemed fine at the time. Yesterday I noticed we had no wireless internet so I went and checked. Sure enough...no connectivity on my desktop that's directly linked to the router, etc.
I tried rebooting & then resetting the router...got connectivity, but as soon as I plugged my PC into the switch...no IP address. I played around with settings, wiring configurations, etc...I'm pretty up to speed on this setup so I felt I exhausted every option. I thought my router went bad...gave me an excuse to go get the latest so I brought home a NetGear N750...hooked it up. As soon as I changed the LAN IP address range to condense the #of IP addresses I'm giving out again, the LAN connection to the PC was lost...I could not get it restored. I finally got it working, bypassing the GB switch, but the wireless would lose connection literally after a few seconds.
I ended up taking the NetGear router back and bought the exact same DIR-655, but this time it was HW version B1 instead of A and it was firmware #2.00 or something like that. I hooked it up when I got home...configured the system to exactly the way I had it before and PRESTO!!! My system is working like it was before. I can only think that the firmware upgrade I made on the previous router screwed something up in my system. Anyway, it didn't sound like there was a way to revert back to previous firmware versions, but I'm sure there is If you're having issues like mine I would strongly recommend buying a new one and leaving the old one in the dust! I hope this helps you as I was pulling my hair out trying to figure things out.