Smoke / Heat detector

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My smoke detector has randomly started to make a sharp piercing ‘Blip!’ sound every minute or so, has anyone else had this happen?

I have pushed the ‘Hush’ button and turned it on and off from the mains but it still makes the ‘Blip!’ sound now and again.

Any ideas on how to stop it, there hasn’t been any cooking or smoke or from anywhere, so can’t think what has triggered it off?