My new 1,5 TB ext4 Hard Disk makes mysterious noises and fails to read and write. But not always. Sometimes it just works. But then I get those following errors. Does anyone know a solution for that or is my new WD Caviar Black 1.5 TB hard disk broken?

[  551.162286] ata7: SATA link down (SStatus 0 SControl 310)

[  551.162294] ata7.00: link offline, clearing class 1 to NONE

[  551.178223] ata7: EH complete

[  551.190802] ata7: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen

[  551.190807] ata7: irq_stat 0x00000040, connection status changed

[  551.190811] ata7: SError: { CommWake DevExch }

[  551.190818] ata7: limiting SATA link speed to 1.5 Gbps

[  551.190822] ata7: hard resetting link

Update Mainboard P7P55D LE: http://www.asus.de/Motherboards/Intel_Socket_1156/P7P55D_LE/#specifications