Hi, I have searched extensively and only found a similar problem discussed regarding RPi but not AppleTV. On RPi the solution appears to using a better psu which is obviously not an option for AppleTV.
Basically, the OSMC install to hard drive went fine, I had been using XBMC 13.2 until now, and if I boot with a USB stick full of media plugged in, everything works well and video playback is smooth.
If, however, I remove the USB or plug in a USB after OSMC has booted, it locks up.
I have tested different USB keys with different filesystems. (FAT32, HFS+)
Any advice would be appreciated. Thanks!