I think I've found the culprit here:
root@Kirito:~# dd if=/dev/sdc of=/dev/null bs=4k status=progress
3133599744 bytes (3.1 GB, 2.9 GiB) copied, 16 s, 196 MB/s^C
802639+0 records in
802638+0 records out
3287605248 bytes (3.3 GB, 3.1 GiB) copied, 16.7633 s, 196 MB/s
root@Kirito:~# dd if=/dev/sdb of=/dev/null bs=4k status=progress
275914752 bytes (276 MB, 263 MiB) copied, 15 s, 18.8 MB/s^C
67394+0 records in
67393+0 records out
276041728 bytes (276 MB, 263 MiB) copied, 15.1245 s, 18.3 MB/s
root@Kirito:~# dd if=/dev/sdd of=/dev/null bs=4k status=progress
4916891648 bytes (4.9 GB, 4.6 GiB) copied, 16 s, 307 MB/s^C
1204285+0 records in
1204284+0 records out
4932747264 bytes (4.9 GB, 4.6 GiB) copied, 16.0833 s, 307 MB/s
sdb is my 3TB drive, maybe it's becoming to fail, unsure why now though
new diagnotics attached
kirito-diagnostics-20211212-0315.zip