Hi, Here's what I do (I can replicate the error most times). Camera loaded with latest Nightly Build as of 15-Jan-2016.
Camera turned off, HDMI cable out to monitor. Battery and SD inserted (with ML updated of course) Turn camera on. Liveview image appears on monitor. Press record. (Recording 1080p/25) Camera records. Press stop. Camera stops. Press record again. Camera mirror drops. Camera hangs. Requires battery eject and reload to reset.
Infrared remote control operation sporadic when HDMI out is operational. Tends to work once, then never again.