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Well, whatever it was, HTC seem to have fixed it in their Android 2.2 OTA update. Since getting the update, I've shut down my phone now and then just to check, and the longest it took was about 15 seconds, after I had used it heavily for several days without shutting off.
So, no need to use app killers, unmount the SD card, disable backup etc. Just make sure you get the latest update.
Well, whatever it was, HTC seem to have fixed it in their Android 2.2 OTA update. Since getting the update, I've shut down my phone now and then just to check, and the longest it took was about 15 seconds, after I had used it heavily for several days without shutting off.
So, no need to use app killers, unmount the SD card, disable backup etc. Just make sure you get the latest update.

Can the pair of you above confirm whether you are still on version 2.1...