The new update for big team battle started fine but then got stuck at 36% and came up with the screen there was a problem with the update. I have tried it multiple time, have power cycled the Xbox and checked my network connection multiple times and it refuses to even start the update.
Edit: found a solution. Hard reset the console then go to network settings and do a network test. Update should start up properly after that. 
Same here… Stuck at 44% and refuses to go any further. Hard power cycle and still no luck… 