Motorcycle/moped for short distances (also in winter)

Hello! After having had numerous problems (gasifier, ignition plugs,..) in recent years with a kawasaki he-5 and suzuki sv650 I need a more robust motorcycle, because I have to drive short distances in the city due to work (4-15km), also often in the night where the engine can not really get warm. general question: are there newer models generally more robust? can you say: the more cylinders, the less vulnerable or vice versa? are there motorcycles that meet my requirements would? or do I have to switch to a scooter for this? would look forward to tips / experiences!