What makes something like this just stop working?

So I purchase a WD TV lIve G3. Seem to remember it working fine for a while. Now, without moving the WD or my router. It will no longer play most video files. Straight rips from my DVDs to MKVs and Video_ts folders with Dolby Digital sound is no good. Plays for a few seconds and then starts stuttering with no audio. Is a straight DVD rip too much to handle for wireless N? I see WD got cheap and omitted support for 5GHz, which through experience is way better at this sort of thing.

Geir

Oslo

Norway

Probably something in the environment changed causing substantial interference.