We use this for my son when he sleeps. ...

We use this for my son when he sleeps. HOWEVER, whenever we set it to run all night long, it turns off about an hour later. I made sure we didn't set the timer. We even tried putting in new batteries and it still shuts out. It still shuts off. We exchanged it for a new one but it still did the same thing. I wish I could return it and get our money back since we need one to run all night.

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