Hmm.. yeah, it looks like there might be a problem with the firmware. In that case, yes, you can install an earlier version (which it looks like you already did). Just put it on the card like you would any other firmware (try one that you know worked just fine and was relatively stable. I know 28 seems to be decent and I haven't heard of any problems.. I think 23 was iffy for some people) and install it.
Hopefully this will fix the issue.
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