To clarify, do you mean the suction and brush motion shut off in the upright position, or that the entire unit shuts off?
If the latter, most Dyson uprights shut off the brush unit in the full upright position and shunt the suction into the handle for use with the accessories. There is also an on/off for the brush, next to the main power button for the DC25. If it's off ( or stuck that way), no brush motion. The manual also notes, 'for use, turn on power and click the foot pedal in back to recline the unit.' (Link to manual here:
http://www.dyson.com/medialibrary/files/dyson/support/downloads/uk/floorcare/manuals/DC25_Manual.pdf See Page 8). The
'High Reach Cleaning' section also notes that the brush bar won't rotate when the vacuum is in the full upright position.
If you are completely losing power, the manual notes that the unit will shut off if the bar is jammed, or if there is a significant line blockage that makes the motor overheat. If this is happening, check the accessory line in the handle for blockage.
Good Luck :-)
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