[Adam Welz] " Anyone else had similar issues with EXCAMs? "
Personally? Never.
You might want to contact Rick Young at:
http://www.macvideo.tv/
Rick did an extensive test on an NX5 a month or so ago and didn't mention any issues like the ones you're having. Off the top of my head he's probably the one with the most experience with this camera.
If I had this camera and was having the problems you're describing, and they were consistent, I'd take the camera back right away and ask for another one if they couldn't rectify the problem immediately. Right now your NX5 isn't reliable enough to use it on a paying gig.
My .02
- Don