I bought my GH4 in September 2014 with an August 2014 build date and to be honest, haven't really used it much since buying it (I have a GX7 that I've been using mostly). Fast forward to today, I'm at Disney World with the GH4 and have taken about 300 photos so far and really happy with the performance and quality of the camera. Then I went to take a shot of the castle at Magic Kingdom and the camera made a loud "clunk" or "pop" type sound. I was in Aperture priority mode when it happened. Not realizing what was wrong, I set it to Program mode and took another shot. Same clunk sound and then a smell of burning plastic. I finally realized what had happened. The flash was in the closed position, yet fired on both shots (confirmed in EXIF data). I took the battery out of the camera and didn't use it again. Later, it powered it up again and it seems to be working normally, but clearly there is something wrong and I am hesitant to continue using it. Thankfully, I also brought along my GX7 so I can continue to take photos. I almost left it at home but am not glad that I didn't. I've read various posts about the flash issue on the internet, but haven't yet read of any actually being fixed. Does anyone know what Panasonic does to fix this issue? Do they replace just the flash unit or the logic board or ...? I'm not liking the idea of having the camera taken apart as I don't think they can ever be put back together the same as the factory. I had issues with my GH3 that required 2 trips to the repair shop because they had not assembled the monitor hinge correctly after the first repair and the cover fell off. I'm quite disappointed now that my GH4 needs to go in for repair and has barely been used.