Netgear N750 (WNDR4000) Internet dropout issues

I recently bought Netgear N750(WNDR4000) router and I noticed that it constantly losing Internet connection. Before I had Linksys wrt54g router ( with tomato firmware). It was very stable and I never had this Internet connection issues. I wasn't sure is ir related to my Internet provider or to the router itself. So, I disconnected the N750 Netgear and connected back my old Linksys wrt54g four days ago. The internet connection was stable, never dropout happened for 4 days. Once, I disconnected Linksys wrt54g and connected the N750 Netgear, few hours later Internet got disconnected.

So, what it can be related? What setting to check? I have Win7 installed on my laptop. Any help is appreciated.

I just purchased the same Netgear N750(WNDR4000) router yesterday and updated to the latest firmware V1.0.0.88_9.1.77,
and am also seeing dropouts. Likewise I had no such dropouts with my previous Linksys Dir655 router.
In the WNDR4000 log I see entries like (latest first)
[Time synchronized with NTP server] Monday, Jan 16,2012 17:23:51
[Internet connected] IP address: Y, Wednesday, Jan 01,2003 00:00:06
[DHCP IP: (192.168.0.32)] to MAC address X, Wednesday, Jan 01,2003 00:00:05
[Internet disconnected] Wednesday, Jan 01,2003 00:00:05
[DHCP IP: (192.168.0.17)] to MAC address X, Wednesday, Jan 01,2003 00:00:04
[Initialized, firmware version: V1.0.0.88_9.1.77] Wednesday, Jan 01,2003 00:00:02
[UPnP set event: Public_UPNP_C3] from source 192.168.0.17, Monday, Jan 16,2012 17:23:09
[Internet disconnected] Monday, Jan 16,2012 17:23:02

What firmware are you using?