when I had problems here, I also did not see hard errors w/ application code, 
just slow performance (70MB/s or so).   When I ran the manufacturer's drive 
test code it did show up internal issues (compression/crc/etc not withing 
manufacturer specs).  

Not saying that this is your problem at all, Just commenting on a possibility.

When this happened, the drive threw some errors which also caused the SD to 
crash at least here.

>> Would also verify your drive.   I've had issues with LTO drives that just 
>> flake out over time and required replacement from the vendors in the past.  
>> Most vendors supply a test utility.
>
>Running a btape write test right this moment.  (And for the past several
>hours.)  Coming up on 800GB written with no errors.
>



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