Hi Gavin, I've not seen this problem before but I will try to help if I can...
When you say "I then go and select the karaoke option", please elaborate
then you say " I then choose a song it starts playing", do you mean a karaoke track or a standard mp3 ?
"and then i choose another it then boots me out" mp3 or karaoke track ?
has this started since you updated to latest version, was it playing karaoke ok before update ?
when it boots you out what happens, any error message or anything ?