Slow Quest Vehicles (Cold Hearted specifically)

Hi

So it seems like all of my flying quest vehicles move very slow and are unable to move up or down only along the plane at which they were summoned. I've tried relogging and disabling all addons but nothing seems to solve the problem. Specifically for the cold hearted quest in SP, I can't move the drake up or down to actually reach more than 2 of the ice cubes, and when I go to leave to take them back it moves at a snails pace.

Thanks