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It seems the only way I can *force* the unit to do this--- that is, in an effort to deliberately reproduce the issue--- is to open several applications that work with the memory card, including in my cases Spb Insight (while running an update), Sprint Music Store, the camera album viewer, etc., have them running for a few seconds, push the power button to put the device in standby for 10-20 seconds, turn the unit back on, and use the Quick Menu's "close all" button to exit the applications. Then when I check the memory card, I have the corruption. Reset and everything's fine.
So far I have removed the power management keys in the registry as described previously, disabled the FATFS cache (which was already set to 0 KB anyway), and applied a previous HTC patch for this issue from another model (P3300 rings a bell). After removing the power management keys, Tom Tom stopped auto-launching, but that problem reappeared after installing the HTC patch. However, since installing the patch, I have not been able to force the memory card into a corrupt state, but that's only been a couple hours ago so it's too soon to say if the combination of this stuff will fix the issue.
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