For Dutch language support there is a Dutch Mede8er forum:
http://www.mede8er.nl/forum/index.htmlI suspect you have some HDMI CEC issue, but as you are not giving any feedback about what brand and type of Sony surround set you are using, it is difficult to give more details.
Check if your TV and surround set has HDMI CEC option enabled and try to disable that to see if the problem is gone after that.