iOS 12 sd card reader problem

I use every day the original Apple Card Reader model A1441 to transfer my photos to my devices two iPhone 7 and one iPad Air 2.

Soon after i update my devices to iOS 12 the card reader stop responding when i connect it with the iPhone, the ipad, or the macbook air. Strange thing is that i can see the card in the computer’s disk utility.

i don’t know if the question is put at the wrong place. so sorry…

any suggestion will be appreciated!