I have been having a similar issue.
In my case, every couple of days, the router stops processing http/https traffic until reboot. Skype works, ping works, but not http. Furthermore, I cannot access the router login page.
I reboot the router and everything is fine.
This started quite a bit of time after I upgraded to v1.32NA, so I don't think it was the firmware upgrade (at least it was stable for awhile after the upgrade.)
I am about to perform a factory reset and manually setup the router again to see if that helps. I've just been too lazy to try thus far... :-)
Anyone else seeing similar weirdness?