[FS#927] SQUASHFS error: xz decompression failed

[LEDE Bugs]

The following task has a new comment added:

FS#927 - SQUASHFS error: xz decompression failed
User who did this - Rob White (bluewavenet)

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The image I have built is 6.2MB and both tftp and sysupgrade work fine with no issues other than this.
Devices normally sit around 7 to 9 MB free ram, dropping occasionally to 1.5MB under high load, very quickly recovering.
The only problem is the occasional squashfs read errors, some of which are terminal..
My first thoughts were flash failure but multiple devices show the same symptoms.

Currently I am thinking the **xz decompression is using excessive amounts of ram** and failing.
I do have config and data files built into the squashfs but the largest is only a few KB.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=927#comment3078