This isn't a question for help, but rather a trip report and recommendation.
I've had my B2 for several weeks now, and at first I connected only with the WIFI dongle that shipped with the product. For basic use, it was fine (though fussy with remembering Sonos zones), but I was very frustrated with remote connections for any sort of file manipulation, such as cleaning up file and folder names. (I'm a bit of a control freak in that department.)
I finally went and read the instructions to remove the back panel and inserted a flat CAT6 cable, wired it to a switch in my home office, and it's a night and day difference. Not just for file naming, but for backing up, moving music onto the B2 that was ripped elsewhere, etc.
This is all obvious to most of you, I'm sure, but for anyone on the fence or intimidated by the need to remove the cover to plug in, don't be shy. It's easy (4 small screws), fast, and makes a huge difference!
-Chris