I have a DIR-655 now running v1.31 and with "DNS relay" turned off.
With the "DNS Relay" feature on, the unit would lock-up occasionally and then it either would be completely dead and unreachable or the internet connection would not work.
Now with the "DNS Relay" feature off, the unit seems to function just fine traffic-wise, but in the last 15 hours my unit has rebooted twice for no known reason. After the reboot the unit is usable, but all connections are reset including my VPN connection. This last reboot was only 90 minutes after a previous one. Before that the unit was running for 13 hours just fine.
Obviously this release has some problems. I'm asking D-Link for a way back to a more reliable version of software until these issues can be resolved. Please provided a method to reinstall a previous version of firmware as this one is not ready for reliable usage. I can no longer recommend this product to others and the D-Link brand suffers as these issues continue.
Lastly: before my upgrade to v1.31 my unit had no problems and ran for days and weeks without intervention, so I do not believe my hardware is at fault.
(Running v1.31 on A3 hardware)