USB-C hub (bus-powered) doesn't work after Mac mini reboots

After I unplug it and plug it back into the Mac, the various devices that are plugged into the hub are suddenly seen by macOS and they all work perfectly fine until the next reboot. I have a Samsung SSD plugged into it, and a couple of dongles (for a 3rd party wireless keyboard and a trackball). Like I said, these devices function great for days, weeks, etc. until I reboot. This doesn't seem like expected behavior, and I don't think it happened in the past, but I have been using this Mac more frequently recently and have had to reboot it a few times.