I've got a few microSD cards that my Touch just doesn't like. Just like you, sometimes the device recognizes a card, sometimes not, and when it does recognize one of the cards the subsequent behaviour is odd. There's no rhyme or reason to which cards work and which cards don't. The cards that fail in my touch all work in other devices fine. When I telnet into my Kobo and check the kernel log with dmesg I can see the errors with the cards that don't work, so I know it's not just a software glitch but something lower down with the kernel or hardware.
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