We followed the guideline for the WR001 as you suggested and Roku was nice enough to send out a free replacement. The largest part of the problem with this transaction was that from the time of the request to the time of the delivery 12 days had passed (January 20th to February 1st). Being that the owner of this 3811X had it fail on the 14th of January and had no way to diagnose the problem, they had a Roku that was down for two-and-half weeks.
The dishonest "fix" would be to pick up a 3810X at Walmart/BestBuy/Target/Home Depot/Lowes/Staples/Sam's Club/Etc. (it's $40 right now through February 6th), gently open the box, swap the WR001 Advanced Wireless Receiver from the package, then return it back to the store as defective. After speaking with CSRs at a number of BestBuy locations, it sounds like this is happening quite often. Even on physically damaged WR001s. And we heard similar stories from the Target Mobile guys. Of course the folks in the back of Walmart rarely see defective returns so they don't have a clue.
It just seems like there would be a better replacement procedure in place. This is something people would gladly pick up locally if it was available and under $10.