Files opened from Extreme Portable 1TB cease to be accessible after about 15mins

As title. The files are still there, it’s only that I will need to close and open again. Not fatal, but really annoying.
Anyone knows how to fix it?

Hi @Siliconmosaic,

Have you opened a Support Case? If not opened, for more information, please contact the SD Technical Support team for best assistance and troubleshooting:

Not yet. Will do. Thanks for the reply