External USB3 disk disconnects and reconnects spontaneously

I have an external USB3 disk, a Toshiba Canvio Basics, plugged in to one of the USB3 ports, and it disconnects and reconnects spontaneously from time to time, which causes problems. (I mean the disk disconnects from the OS’s USB bus. OS is Debian Buster.)
This does not occur if the external disk is plugged in to one of the USB2 ports. Also it does not occur when the disk is plugged in to a USB3 port on another model of mini pc.
Has anyone else met this problem on the gbox pro, and more importantly, found a solution?