a quick update:
I've activated 2 other Pi's
One works now since 2 Weeks without problems, BUT the other one died with the same symtoms 2 days ago...
I've replaced it with the last Pi I ordered and up to now it works
That a failure rate of 50%... not that impressive
Are there any statistics on RMAs available?
Maybe I just got mine from a bad batch or sth like this.....