GX100 Dead Pixel Problems

Hi,

after I read about dead pixels in this thread:

http://forums.dpreview.com/forums/read.asp?forum=1013&message=25231498

I remembered some night shots I did with my GX100. In these pics I saw stars in the dark sky although I was sure that it was a cloudy night.

Now I shot a few pics with covered lense and 2s shutter speed. In fact there were 'stars' again, in each pic on the same place. I wouldn't mind if there were 5 or 10 defective pixel, but there are hundreds!

Here is a 600x450 crop of one of my test files (154kB):

Could some of you GX100 users please verify if this is a common problem? If not I have to send it for a service/replace.

Thank you!

Tom