According to the log you are hitting the rather common UAS issue with your USB drive (lots of cheap drives have broken UAS implementations and Intenso doesn't have the best reputation).
Code
Feb 06 12:22:13.841587 LibreELEC kernel: sd 0:0:0:0: [sda] tag#21 uas_eh_abort_handler 0 uas-tag 3 inflight: CMD IN
Feb 06 12:22:13.842112 LibreELEC kernel: sd 0:0:0:0: [sda] tag#21 CDB: opcode=0x28 28 00 77 3b c7 88 00 00 68 00
Feb 06 12:22:13.871559 LibreELEC kernel: scsi host0: uas_eh_device_reset_handler start
Add usb_storage.quirks=152d:0578:u to the end of /flash/cmdline.txt (on the same line!) to disable UAS for the SSD.
so long,
Hias