Hi @Michelle11,
A warm welcome to the Bunnings Workshop community it is fantastic to have you with us.
Many electric pressure cleaners have thermal overload protection, which automatically shuts the motor off if it gets too hot, but this should not be happening regularly if you are operating the machine correctly.
I'd suggest you return your pressure cleaner to the store of purchase for a replacement unit. It seems likely there is a fault which will be covered by the warranty.
Remember to bring your receipt if you still have it. If not, ask to speak with a manager, as they will be able to reprint a receipt for you if you can provide the time and location of the transaction. You can find the time of the transaction in your bank statements.
Let me know if there is anything else I can assist with.
Jacob
