I bought this router this weekend as i already had same model but different hardware version 3 years back but this new one HW U1 with Firmware 1.08 (No new firmware after this out yet dated 20 June 2013) has several issues :-
1. PPOE connection sometimes fails to authenticate when i start the router.
2. Internet disconnects after 1.5 ~ hour for a minute.
3. Sometime even it shows connected nothing is working so i have to reboot the router.
I'm not sure whether its my problem , or fault device or common bug since several other users have also reported the same issue.