i had the same problem with my dc07 cutting out after getting very hot and was initially advised ny a repair shop that it was the motor. anyway rang dyson and they advised that it could be a problem with the cyclone and that they would send me one out free of charge along with a new sponge filter.
i decided to take a look inside the cyclone itself anyway and removed the three screws that hold the handle one to the cyclone itself and was amazed to find that it was blocked solid with compressed dust and cr*p.
cleaned it all out over the dustbin and refitted it all back together .
hey presto!!! no more overheating and it sounds much better but performance still bad as it now has a split internal hose but dyson are sending one out free of charge along with all the other gubbins
well done dyson your customer service is bob on !!!!
jon grindrod
June 2006