After power down, I have to rescan or even plug HDD into different port

If I lose power (I am in a garden shed/office) or even if I power down volumio for the night etc., when it comes up again, there is no library.
Rescanning doesn’t happen. I have to physically unplug the USB HDD from one port and put it in another. Then it scans.
More annoying than anything, but wondered if anyone has this issue?
HDD/Cable all fine. Rapsberry Pi all fine.