Definitely, 5 GB is a lot for temp files. Have you tried that card in any other recording device to see if it is just the Mavic recordings, or everything that is holding that much?
I just did an orbit two days ago with Litchi, and it worked perfectly. I am on the latest updates, and using an iPad Air 2. Have you tried a waypoint mission to see if those are working?
I've now seen a couple of photos of people that still have that yellow sticker on above the gimbal. I took mine off when I first got the Mavic, but wondering now if I should have left it on.