If the Roku2 XS was 5Ghz-capable, we would not have this problem, as 5Ghz transmissions are unaffected by microwaves. So, I paid $100 for the "best" Roku on the market, and enjoy a blazing 5Ghz wireless signal from my router...but can't get them to talk with each other.
1.) Roku 2s in general are only single band, so those of us with a dual-band router(mine is a Cisco E3000) will have to settle with the 2.4ghz network since the R2 is not dual-band.
2.) I do however have a Roku 1 XD|S which is dual-band that can run on both 2.4ghz and 5ghz.
My Roku 2 in the media room is 25 feet from my router connecting to the 2.4ghz network while the XD|S is the master bedroom 50ft away connecting to my 5ghz network.
Both my players work flawlessly over my 6mbps connection.
If you want to take advantage of your 5ghz network, go ahead and purchase an XD|S from http://www.roku.com/accessories#6
If you want to go all the way to make your Roku 2 XS to connect over your 5ghz network, there is a way though. Go ahead and purchase a dual-band wireless bridge that can connect to the Roku over ethernet.
Roku connects wired to 5ghz capable wireless adapter > 5ghz capable wireless adapter connects to 5ghz network > done.
I have a Cisco WET610N that I use for my PS3 so it can connect wirelessly to the 5ghz network from my E3000. For curiosity's sake, I took my wireless bridge and connected it to my Roku 2 XS. On my XS, I ran the network as "WIRED" and everything went fine.
Yes, there is a way to make your Roku 2(model XS) to connect to your 5ghz network but it will need some additional hardware and reconfiguration.
To put it straight, spending another ~$60 for the wireless bridge is not worth the fuss.
Try a power line. Those work great as well, no interferences.
If you do decide to go for the R1 XD|S, the only downside is that since it runs on the Roku 1(3.x software), that means it doesn't come along with adaptive streaming and closed caption for Netflix.
One plus though is that the movie WILL always show in the highest quality possible. So as long as your internet speed is up to the task, you'll get HD quality(provided that the content is in HD) all the way through compared to adaptive streaming on the Roku 2.
I may not be getting closed caption with Netflix on my Roku 1, but since it can work flawlessly over my 5ghz network from 50ft away I'll consider it a bargain.
Getting a new Roku(a Roku 1 XD|S on top of that) may not be the best solution I can suggest to you, but it is an alternative.
Hope this helps.