I have flown my Typhoon H RS 5 times with a samsung 64gb sd card, the first couple of flights it was great. Then one or two of the videos were corrupt and others on the same sd were fine. last flight all five videos were corrupt! I phoned Yuneec tech support and they were very nice, the guy said to use a smaller sd card because the 64 gb is too big and was surprised it had be used successfully on previous occasions. I am yet to try a smaller card how ever a friend of mine has the same drone and sd cards we bought together and it works fine. I explained this to yuneec guy and he said if a smaller card doesn't work then i can send them the camera to test.
If the card is a good one, 16 to 128gig cards generally work fine for camera work in class 10 or U3. Formatting helps. I prefer a 32 to 64 to avoid storing too many videos and photos on one and since I download the files after a day's flying there's no need for a mega storage card. I also don't lose as much product if I lose a card, which has happened. The only corrupt video files I've obtained occurred when I forgot to stop a video before landing. For firmware upgrades you want to always use a 16gig card, especially for a -16 upgrade, so save the one that came with your bird.
A lot of people go on line and search for the cheapest card they can find on E-Bay and Amazon, paying no attention to the brand. They often get what they pay for. There are a lot of cheap cards that start life deficient in many ways, just as their are counterfeits and those that lie about storage capacity. There are some goods deals out there but those are outnumbered by those that are crap to begin with.