I had this happen the other day a couple times. You have to remove the battery to get the camera to re-start. Olympus is monitoring online reports and investigating. The camera basically goes dark, nothing shows as being on. It's an unrequested shut-down.

No problems with mine yet after 2 months of daily use. I do wonder how long that tiny plastic camera on-off lever is going to last though. On other other hand, nothing ever wore out on my previous Oly cameras.

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E-PL1, E-M5, 14-42, 40-150

Touch wood, it's only happened once so far with the Panny 20/1.7 mounted. So far my only solution is to not use the 20/1.7 on the E-M5.

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Nic
E-M5, GH1
Flickr Photostream
>> Insert quote here <<

It happened to me once, when I had switched from the 20 to the 45. But I have used both of these lenses a lot on the E-M5, without any more problems than this single occasion.

Proof?

This may have happened to me as well. I blamed the lens (Panasonic 100-300), but maybe I was wrong. Taking the battery out and putting it back cleared whatever the fault was.

It seems happening with Pany lenses, especially the 20mm f:1.7. I got this issue many times in 2 month. Apparently there are 2 different version of this lens, the most recent one is the fastest too (perhaps more silent too). Unfortunately mine is from the oldest batch (but happy with it, as I shoot a lot of nice pics with my GF1 )

Some user's found a "tricky" way to avoid it .. working for some people :
changing the sleeping time to 5 minutes, confirm, back to the menu, changing back to 1 minutes .. confirm. Seems working for mine ;)

Probably fixed in the next Oly firmware

I'm using all Olympus lenses. Absolutely no problems of any kind from mine so far. I've had it since late April. I use it frequently.

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Photo Blog: http://openbloom.blogspot.com/
Web Site: http://www.openbloom.com/galleries

Never knew Panasonic silently updated the 20mm f/1.7 with faster AF and silent motor, you got proof of that?

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My Gear : EM-5, E-1, EPL-1, + Lumix 20, 14; Fujinon 55; OM 35, 135; mZD 45, 12-50, 14-42, 40-150R; ZD 35, 14-54 mkI, 40-150 mkI

I haven't run into a lockup yet with my E-M5 and I use Panasonic lenses about half the time. I do not think, though, that my camera goes to sleep much - got in the habit of powering it down most of the time.

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Kyle / E-M5 and E-PM2
Flickr Photostream