Up until recently I have been able to play back video by just putting the micro sd card into a card reader attached to my Sony 4K TV. Out of the blue the TV stopped “seeing” the card/ reader so I reset the TV to factory default and when that didn’t make any difference I bought a new reader which also made no difference. I started to suspect the USB port on the TV but found that if I copy the video files from the SD to a USB stick they will play perfectly on the TV, I'm perplexed. Has anyone seen this issue?