Hi
Thought I’d post this very important information. I use a xt20 . It was filming for 5-10 secs before displaying ‘ write error’.
After going round in circles on settings menu , formatting card etc I worked out by searching ‘ how to spot a fake sundisk Sd card’ , I realised I had bought a fake card from eBay!
Put a genuine card in . Bingo ! No issues . Be careful when buying Sd cards , if they’re really cheap , they’re probably fake .
Mark