This happened again last Friday? Apr. 1 in the late afternoon the S8 was stopping at Ismaning as well due to no power at Besucherpark and Flughafen. Having been on those replacement buses before I backtracked from Ostbahnhof and caught the Lufthansa bus at Hauptbahnhof. Cost me an extra €10.50 but well worth it and despite it being the rush hour the bus got there just as fast and I actually had the luxury of a seat.^ Seriously thinking of taking the bus again in future.