Syslog with "I/O error" and "interface fatal interface error" for one of my cache drives -- is the drive failing?

I noticed this entry come up occasionally in my syslog and wondering if it's anything to worry about. I'm not totally sure what it's indicating. The unraid system is not informing me of any SMART errors or anything on that drive which is in my 2 drive cache pool.

Apr 19 03:27:07 Tower kernel: blk_update_request: I/O error, dev sdc, sector 111948688 op 0x0:(READ) flags 0x80700 phys_seg 126 prio class 0
Apr 19 03:27:07 Tower kernel: ata2.00: failed command: READ FPDMA QUEUED
Apr 19 03:27:07 Tower kernel: ata2: SError: { HostInt PHYRdyChg 10B8B LinkSeq DevExch }
Apr 19 03:27:07 Tower kernel: ata2.00: irq_stat 0x0c400040, interface fatal error, connection status changed
Apr 19 03:27:07 Tower kernel: ata5.00: failed command: READ DMA EXT
Apr 19 03:27:07 Tower kernel: ata5: SError: { HostInt PHYRdyChg 10B8B LinkSeq DevExch }
Apr 19 03:27:07 Tower kernel: ata5.00: irq_stat 0x0c400040, interface fatal error, connection status changed

here is screenshot of the SMART data:

https://imgur.com/a/5BomEm8

diagnostics attached.

tower-diagnostics-20210419-0926.zip

Edited April 19, 20215 yr by tmchow