SanDisk Ultra 64GB too slow :(

[jogi]

I have now tested a week. formatted in anafi quick / total with the same result: typing error at the latest after 3 min regardless if 4k or hd. that annoys me because I have some of them and unfortunately now SanDisk Extreme has to buy ...
it seems that manufacturing tolerances exist because other users are fine with Ultra's

 

[Lestat]

i have been using SanDisk Ultra 128 GB microSDXC Memory Card i have now done 20 flights i have had one problem in all the flights that was when i tried to change the camera setting from standard 4k to hyper-laps 120 while it was in flight recording and i got an sd card error
landing the drone and restarting it cleared the error and i was able to then record hyper-laps 120 with out a problem