It could actually be something internal to the manufacturing on the card. I know that both SanDisk and Samsung actually make their own cards, unlike say Kingston and Patriot, etc. The card that I replaced my SanDisk card with is a Patriot 32GB Class 4, but I believe the internals are actually manufactured by Toshiba. Maybe Samsung hardware and SanDisk memory just isn't playing nicely...?
One thing that seems to be glaringly obvious is that almost all the problems seem to be with SanDisk 32GB UHS-1 cards. Could just be a coincidence that it's the thinnest card I own.
Does anyone know if there's an Android app (or even a PC app) that will show the actual manufacturer of the card? I know SD Tools used to do this, but on my newer phone and tablet it only gives the card info on the internal memory (even when I change the path to the external SD card).
Samsung GALAXY Note II
hTC EVO 4G
acer Iconia A500