A few months ago it seemed that I found a solution by changing the Energy settings for the WiFi-adapter. Since then the problems have occured again but I havent posted anything in here as I have been busy trying to access the Internet :).
After hours and days of irritation and troubleshooting the following actions seem to work, at least the connection is more stable with fewer intteruptions.
Follow this link :
where especially the DOS-commands at the bottom of the page seems to fix the issue !
Wishing all of you with this problem success !