Micro sd card dying or something else?

Recently, not even a month ago, I’ve bought SanDisk micro sd card and put it into my LG K8 everything was fine until yesterday when sd card became so slow that it took 20 minutes to copy 200 pictures (about 300kb each) and opening apps from sd was unavilable . So is sd card dying or is something else? And is there any android app that checks for sd card health?
Sd card is HCI class 10