I use ATT DSL, and it is PPPoE.
When the problem happens, DSL modem shows it is still connected. All the LAN connection and wireless access is OK.
It looks the WZR-HP-G300NH does not process anything to/from WAN.
I stopped bittorrent, media server, and shared folder, but it does not help.
I usually restart PPPoE connection or restart the router, and it fixes the problem.
I am currently using WHR-G54S to connect to DSL, and it never has the same issue.
I attach WZR-HP-G300NH as the AP to G54S (disabling wireless), and there is no Internet connection issue.
But, I want to eliminate G54S as I want to use it for a different purpose.
I do no think I had the problem with the previous version of firmware. 1.65 has the problem.