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Feb 27 18:26:04.338050 LibreELEC kernel: usb 3-2.1: new high-speed USB device number 3 using xhci-hcd
Feb 27 18:26:04.338150 LibreELEC kernel: usb 3-2.1: New USB device found, idVendor=2537, idProduct=1066, bcdDevice= 1.00
Feb 27 18:26:04.338251 LibreELEC kernel: usb 3-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Feb 27 18:26:04.338333 LibreELEC kernel: usb 3-2.1: Product: NS1066
Feb 27 18:26:04.338429 LibreELEC kernel: usb 3-2.1: Manufacturer: Norelsys
Feb 27 18:26:04.338522 LibreELEC kernel: usb 3-2.1: SerialNumber: 0123456789ABCDE
Feb 27 18:26:04.338612 LibreELEC kernel: usb-storage 3-2.1:1.0: USB Mass Storage device detected
Feb 27 18:26:04.338731 LibreELEC kernel: scsi host0: usb-storage 3-2.1:1.0
Feb 27 18:26:07.743322 LibreELEC kernel: scsi 0:0:0:0: Direct-Access Generic HDD 0 PQ: 0 ANSI: 0
Feb 27 18:26:07.744202 LibreELEC kernel: sd 0:0:0:0: [sda] Media removed, stopped polling
Feb 27 18:26:07.744306 LibreELEC kernel: sd 0:0:0:0: [sda] Attached SCSI removable disk
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The only mention of a USB drive device in the system log ^
The "Media removed, stopped polling" makes me suspect power issues. You can add "usb_max_current_enable=1" to config.txt and see if that makes a difference. Note that RPi5 needs a decent PSU (official one is recommended).