I had that same freeze problem 3-4 times in a couple years with the K20D,
only with third-party D-LI50 batteries almost empty and never with genuine
batteries.
Extracting and re-inserting the battery (or replacing it with a charged one)
always solved the problem on the spot.
With the K-5, it also happened with the original D-LI90 battery. Again, it
happened 3-4 times in a couple years and replacing the battery made the
camera alive again.
I never had to wait for fixing the problem, so I never experienced more that
a few seconds blackout.
Whenever I'm paid for shooting (which seldom happens), I always take two
bodies with me.
Dario
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