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How do I fix WRITE FPDMA QUEUED messages if the SMART report isn’t showing any errors?

This is an OCZ Vertex SSD. I’m told that the first value (raw read error rate) is irrelevant for SSDs. I’m getting a lot of “WRITE FPDMA QUEUED” errors in terminal (why I’m in terminal is another issue, I tried changing the kernel and now it won’t run the old kernel and the new one is not compatible with Mint 20).

The OS has been behaving oddly (3+ second delay on mouse clicks some of the time, ssh password prompt is sometimes delayed by several seconds). I suspect this “WRITE FPDMA QUEUED” is the issue.

This machine was previously running Mint 19 with no issues. But a couple of weeks I moved and had to switch the machine over to using wifi instead of ethernet. Ran into issues connecting so, long story short, here I am in Mint 20 with 3 problems (no wifi, hard disk, ethernet cable running across my floor) instead of 1.

Tried the solutions here. No luck.

This is a bookshelf system, an MSI Cubi, so I can’t switch SATA ports or anything like that. Plus, it seems unlikely to be a hardware issue since it coincided with changing the OS.

Am I missing something obvious in the health check?

health check

errors