It is the real live traffic causing this FPS Drop problem. You do not have to disable the complete online functionalitiy but just disable the real live Traffic at the data menue , then go to the cockpit and then again in the menue and enable the real live traffic again. After that you also have to choose the real live traffic option unter “traffic” again, because it will be automatically disabled when you diable the real traffic at the data menue.
Oh wow, so you did find a solution! Thanks will try that! It seems the sim is loading something (maybe the map?) but it cannot unload it, resetting the function resets the load and thus gives back the fps.
I tried with disabling real live traffic but it did not work for me. But sure it might be of help for others. Maybe 10 hrs of autopiloting needed more than only this one to be disabled and enabled again