I replaced it with a fresh RSHTech 7-port USB hub, as well as the black-display reboots continue on. I am stumped today, in fact beginning to suspect my UPS of spikes or momentary cutouts. Anyway I feel the Sabrent is https://kezialpsf243170.ttblogs.com/8063812/rumored-buzz-on-adafruit-industries-usb-mini-hub-with-power-switch