The grade of the SD card matters as far as reliability. The standard SanDisk cards are Grade 8, which are prone to corrupt files and can have issues transferring also leading to corruption. The next step up would be Grade 10 SD cards, which are known as the Ultra series for SanDisk. These are more reliable as far as being less prone to data corruption and faster speeds for video playback etc. I personally use a Grade 10 Ultra 64GB card from SanDisk, no issues what so ever. There is also Grade 12 SD cards which is the Extreme series from SanDisk. Most reliable and fastest read speeds. Hope this helps!