Thank you for a lot of interesting comments and answers. In fact my disconnecting-problems seem to be solved without I doing anything ! Maybe/probably a lot of other persons have complained to either the Internet-Provider or the telephone-company. Today I have not had one single disconnecting-problem. It wouldnt surprise me if there has been something wrong with server of the Internet-company. Yes, its a free internet-service. I dont pay anything, but I also dont see any commercials.