[137392.910057] ata4.00: exception Emask 0x0 SAct 0x1 SErr 0x80000 action 0x6 frozen
[137392.910077] ata4: SError: { 10B8B }
[137392.910095] ata4.00: cmd 60/20:00:00:00:00/00:00:00:00:00/40 tag 0 ncq 16384 in
[137392.910099]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
[137392.910122] ata4.00: status: { DRDY }
[137392.910135] ata4: hard resetting link
[137393.440060] ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[137393.443642] ata4.00: configured for UDMA/133
[137393.443661] ata4: EH complete
[137393.443769] sd 3:0:0:0: [sdd] 1953525168 512-byte hardware sectors: (1.00 TB/931 GiB)
[137393.443800] sd 3:0:0:0: [sdd] Write Protect is off
[137393.443806] sd 3:0:0:0: [sdd] Mode Sense: 00 3a 00 00
[137393.443848] sd 3:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
 

This drive/firmware is dying slowly.