I eventually stripped mine down completely, and cleaned everything when rebuilding.the machine was as good as new.
Then I got to thinking it must be the safety cutout in the battery. I found a battery online with a greater ampage at only £16. So as a last resort, I thought it was worth a try. Eureka ! It worked !
I don’t think the suction is quite as powerful. But the main thing is that it does not cut out. [br]
I have not tried it on full power, as a dyson rep in curry’s once told me that, it is that which causes a problem with the battery cutout in earlier models.