Help! Lost Clips on EX1 SxS card...

Hi --

I have a pretty serious issue with potentially lost data for the Sony XDCAM EX1.

Earlier tonight I shot a full 8 GB card followed by a full 16 GB card.

On the 8 GB card, my first 10 or so shots were fine... but starting on clip 929_20902, Clip Browser freezes and will not import the clip. A thumbnail image of the clip shows up but the clip will not play. So from clips 2092-2117, this happens, then from clip 2118 on, it's fine.

When I put the card back into the camera in Media Mode, the camera freezes. No thumbnails are viewable.

The 16GB card I shot after the 8GB card is completely fine and plays back in the camera fine.

I have no clue what the issue is... I've owned my EX1 since February 08 and have never had a problem until now.

Can somebody please help shed some light on this situation!

Thank you!

T.J.