*** This bug is a duplicate of bug 1338706 ***
    https://bugs.launchpad.net/bugs/1338706

This question / problem does not really fit here, as it's, as you write
yourself, totally unrelated to the TRIM issues mentioned above and this
is bug report is a dublicate in any case.

That being said your logs don't look too promising and I'd assume an SSD
failure. One of the first things I'd try in this case is having a closer
look at the S.M.A.R.T. stats (smartctl --xall /dev/sdX | less) and
running the different S.M.A.R.T. self tests (man smartctl). This should
give you more information about how your SSD feels and might help to
rule out any software issues immediately.

In any case, you should not discuss the results here but on an
appropriate mailing list or help forum, which bugs.launchpad.net isn't.
(You can also contact me directly via mail, however while I've some
experience using Linux systems, also with SSDs, I'm no ATA / libata
expert.)

Good luck!

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https://bugs.launchpad.net/bugs/1449005

Title:
  trim does not work with Samsung 840 EVO after firmware update
  (EXT0DB6Q)

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