Bump. This problem has been plaguing us since August. I don't know if hard-wiring the device through ethernet could solve the problem because my house isn't run in such a way to make this work. I tried going to a factory default screen saver, as some have suggested, and this has mildly improved things (I think, but I can't quantify it). It isn't fixed by restoring to factory default. I tried that, with no result.
Some other clues: I have the same issue as everybody else, with the crash every five minutes or so, but I have noticed one other thing. It seems like it crashes the last time when a movie I am watching finishes queueing up. After that reboot, it lets me finish my movie without interruption.
The problem doesn't seem to be with not queuing fast enough, because I seem to always have plenty of my movie queued past the point of the movie I am watching. It is really weird that finishing the queue process is enough to cause the crash. Its almost like the problem is in writing to the file system, and the added activity of closing out the file is enough to send it over the edge.
Can we please get a patch to fix this?