[popcornmix]

These are all generated after a reboot, going into movies and then just paging up and down the list until it hangs i.e it is reproducable

There's not much useful in the log as openelec doesn't build the kernel with backtrace.
Can you narrow it down?
Try with overclock disabled.
Try with any USB devices disconnected
If using a sound card module, try without it.
Try with dwc_otg.fiq_fsm_enable=0 in cmdline.txt