Every streamer is a single purpose computer and every computer operating system benefits from the occasional reboot. It does not surprise me to hear of a streamer's performance improve with a power cycle.
Now a DAC is another story. They are much simpler devices and are much less likly o be improved by a power cycle unless you do have a heat/ventilation issue.
Is for my I build my own streamers with a custom Linux that caters to sound processing.