its interesting that my Cache recently got into read-only as well. just found today.
now i need to copy all appdata, and reformat ?
Nov 18 20:40:54 Tower kernel: loop: Write error at byte offset 2887852032, length 4096.
Nov 18 20:40:54 Tower kernel: print_req_error: I/O error, dev loop2, sector 5640336
Nov 18 20:40:54 Tower kernel: BTRFS error (device loop2): bdev /dev/loop2 errs: wr 195, rd 0, flush 0, corrupt 0, gen 0
Nov 18 20:40:59 Tower kernel: loop: Write error at byte offset 3727376384, length 4096.
Nov 18 20:40:59 Tower kernel: print_req_error: I/O error, dev loop2, sector 7280032
Nov 18 20:40:59 Tower kernel: BTRFS error (device loop2): bdev /dev/loop2 errs: wr 196, rd 0, flush 0, corrupt 0, gen 0
Nov 18 20:41:05 Tower kernel: loop: Write error at byte offset 2887852032, length 4096.
Nov 18 20:41:05 Tower kernel: print_req_error: I/O error, dev loop2, sector 5640336
Nov 18 20:41:05 Tower kernel: BTRFS error (device loop2): bdev /dev/loop2 errs: wr 197, rd 0, flush 0, corrupt 0, gen 0
Nov 18 20:41:05 Tower kernel: loop: Write error at byte offset 3727376384, length 4096.
Nov 18 20:41:05 Tower kernel: print_req_error: I/O error, dev loop2, sector 7280032
Nov 18 20:41:05 Tower kernel: BTRFS error (device loop2): bdev /dev/loop2 errs: wr 198, rd 0, flush 0, corrupt 0, gen 0