One of my external hard drive stopped working.

My external hard drive not working/responding error without losing any data. my external hard drive is not working, fails to respond or becomes undetectable, It’s not the first time that my external hard drive, USB drive, SD card or other storage devices not responding while connecting with laptop. my external hard drive suddenly cannot be detected or recognized by laptop. I am worry about this condition and also bought new external hard drive and connect to laptop but same problem occur again so anyone can explain to me to resolve this problem because I am in troubling.

Thanks.