Hi, recently I had 30.000km service and I asked them to replace tires as well. Service consisted also in changing fork oil. I have now Haidenau K60. I went for a trip next day after the service and noticed on highway when I go beyond 110kmph, bike starts to be very unstable. Front fork starts to shake semi-violent (left and right). If I slow to 105 .. all is fine. Before this I used to go 160kmph with no drama. What can be?