I've had the same issue, I don't know what I did, everything is on auto as far as the cam settings. However, it's been at least 35 years from my 35mm days with an old Yashica and Lietz to remember all those settings.
However, when I uploaded my first video to computer, my first thought was a bad card that came with my
EVO II V2 Pro RTK.
Tried different cards. Ended up with the same make card (Scan Disk 128Gb), same card specs
What fixed it for now, and I've taken about 10 videos since i bought the UAV, is changing the media player to Windows Media Player-not classic There's a difference at least on my W7- 10 machines. There's no flutter or jerky videos and it's free. Can't edit with it but it's a quick player to use.
I'm deciding on maybe Adobe but I hate paying subscriptions for software. I'm still looking for other video editing software, just not top priority now with work and other obligations.
I hope this works for you.