If anybody cares, I just sent my N900 router back to WD. I finally heard back from tech support (about 10 days after writing them), and was told to try a reset. Of course, I had already done that multiple times, along with trying various firmware releases. Posed on a 1/2 plastic “feet” that I stuck to the bottom, the router ran cooler and therefore better, but I still had at least daily disconnections.
FYI, it’s easy to get an RMA number if your router is already registered with WD. You can do it online without much trouble at all.
On the other hand, you do have to pay return shipping yourself, which is always a drag. I went with WD’s prepaid UPS deal, which runs $6.95. I’m also not doing advance return, because I don’t feel like having WD charge me for anything else. Besides, I’m happier with my backup router.
If the replacement router works correctly, I’ll probably sell it to recover at least part of my investment. I’m pretty fed up with WD’s attempts to enter the router market. They need to stick with their core product: hard drives.