Odd anomaly with Linksys BEFSR41

Alrighty, for some reason, every so often I'll wake up to my router having it's red diag light on. The cable modem that's in the WAN port is functioning, but I don't get a link light or activity light under the WAN display, but I still get link and activity lights on all the other PCs plugged in.

At first, I thought it might've been a power surge, but it's only recently been doing this since I upgraded my firmware (latest from Linksys. The version escapes me).

I recently setup a home network in my friend's home and his does the same thing too. A quick pull of the power fixes it, but it's getting awefully annoying when you run with Direct Connect >.> *whistles*