* Usually - filter maintenance is the best guess.
* Another problem may be the way the parts fit when you put it together. if for example the filter on the base is not placed correctly - it'll reduce the suck action.
* if all fails - try to see if you still loose force at any of the connections and see if you can replace the rubber seals on the pipe connection interfaces (there are 3 or 4 places where this may happen on the cyclon 8)
Itai
May 2010