Well, it's going from bad to worse... now my connection is "Poor connection", and there is no fire wall detected (the little green earth is clear of any wall).
I looked in "connections, and there are about six (peer) in and out going, plus about a dozen trying to stay on, but changing all the time (protocole 0,6)... now, since I started to write that post, the number of open connection has about doubled, and it says now : good connection... it took 20mn for that ( it is LW Pro, and should go much higher)... I really don't see now what I could change in any config to correct that... what more, it did work OK up to few weeks ago on the same settings... hope some one sees that and has some idea.