Strange problem with a disk

Hi everyone,
my sdd drive has been giving me some issue for some time.

It all started with messages with strange messages in the dmesg but without reporting errors I/O form a sector. From, i don't know, a month i see this messagge:

Code:[1333102.763702] ata4.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[1333102.763706] ata4.00: irq_stat 0x40000001
[1333102.763709] ata4.00: failed command: READ DMA EXT
[1333102.763713] ata4.00: cmd 25/00:00:00:70:1d/00:04:8b:02:00/e0 tag 0 dma 524288 in
[1333102.763713] res 51/40:00:d0:72:1d/00:04:8b:02:00/e0 Emask 0x9 (media error)
[1333102.763716] ata4.00: status: { DRDY ERR }
[1333102.763717] ata4.00: error: { UNC }
[1333102.765018] ata4.00: configured for UDMA/133
[1333102.765147] sd 3:0:0:0: [sdd] Unhandled sense code
[1333102.765149] sd 3:0:0:0: [sdd]
[1333102.765151] Result: hostbyte=0x00 driverbyte=0x08
[1333102.765152] sd 3:0:0:0: [sdd]
[1333102.765154] Sense Key : 0x3 [current] [descriptor]
[1333102.765156] Descriptor sense data with sense descriptors (in hex):
[1333102.765157] 72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 02
[1333102.765163] 8b 1d 72 d0
[1333102.765165] sd 3:0:0:0: [sdd]
[1333102.765166] ASC=0x11 ASCQ=0x4
[1333102.765168] sd 3:0:0:0: [sdd] CDB:
[1333102.765169] cdb[0]=0x88: 88 00 00 00 00 02 8b 1d 70 00 00 00 04 00 00 00
[1333102.765176] end_request: I/O error, dev sdd, sector 10923897552
[1333102.765210] ata4: EH completeteh disk don't have any problem ( i have checked with badblocks ) and if i repeat the operation ( in this case I was doing a file check via sha256sum) the system don't give me any message ( and the sha256sum change it result).

The drive is in a RAID6 configuration but the raid driver never kick it out.

So if the disk is okay ( and I thinks so ) what can be? I want to change the port of the SATA controller... can it help?

any suggestions?

Bye