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I'm just guessing, because I use the exact same SD card as Helena. No issues so far. I'm still on FW 2.03, but I believe Helena still is on 1.x.
Yeah, I don't know (I just looked at the EXIF and mine froze using 2.03 so if it is firmware related, you may want to upgrade). Maybe it's just a random fluke (some have reported freezes that never occurred again) or maybe in some cases, it points to a more serious issue. I just don't know, which is the worst part. When my freeze occurred, I was actually doing a small job but had two other cameras with me so no big deal. If I only had the GR though - say on vacation or travel - I would be pretty upset if it randomly died.