Video link: About 20 secs in you will see the first jolt. Batteries are fine and the Movi isn't going completely limp, it's still trying to do something and we do have some control. we usually regain control and level horizon after 30 - 120 secs (unless another spasm happens). This happened about 5 times yesterday and twice today, but I have no idea what would cause this kind of behaviour. I managed to turn on the data logging for one flight, but I don't think it is the same flight as the one posted above. https://plot.ly/~MartinOsborne/57/ At one point, there is missing data for GPS and a few other items, even though there are always between 7 and 9 sats Alta and M5 Carrying GH4 with Voigtlander 10.5mm and microRemote Follow Focus. Any ideas?