OM-D EM-5 Firmware 1.5 constantly freezing

Hi all,

Today, I took the EM-5 out for a shoot and experienced what must been at least 10 freezes.  The problem would occur either during image review or when saving to card.  I did get card error message several times and on 2 occasions the camera failed to save to card.

Each time the camera froze, removing the battery was the only solution to unlock the camera.  I was using the Pansonic 12-35 and the card was a Sandisk extreme pro 8 GB.  I am pretty sure the card had been formatted in camera.  I have now ordered a Lexar 16 gb 600x.

I am interested in your opinion on whether the issue is with the card or a camera specific issue?  Oh, the same card was previously used in Nikon V1 without any issues.

Your help is much appreciated.

Reza