I'm afraid dyson are extrremely overpriced and over rated.
recently voted worse vaccuum cleaner! Should always buy a henry, cheap and powerful and everlasting.
Anyway, most likely problem is that your vaccuum is blocked somewhere. They have thermal cut outs to prevent overheating.
You should take apart every part possible (without opening it up) Check the filters, wash the dust collector. If it has a hose attachment, take this off and run water through it.
Once you are sure you've cleaned everything possible and changed any filters,you should be ok. If not, then must time for a new motor! (or go for the henry)
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