Movie flicks back to menu after 10-15 minutes

you can read all about problems with mp4 files here…

http://community.wd.com/t5/WD-TV-Live-Streaming/Firmware-2-02-32-Not-playing-all-mp4-files/td-p/778481

support team are aware of problems … hopefully a fix in the next firmware

p.s. 90% of my mp4’s play without issue … one’s that don’t, i remux them to mkv using MKVmerge, then they are ok

MKVToolnix (includes MKVmerge)  http://www.videohelp.com/tools/MKVtoolnix

hope it works for you