Noise from dashboard when cold

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Dear Lexus Community,

Happy holidays to you all.

I am hoping to get some ideas/opinions to an issue I am facing.

I am from Canada, and as you may know, we have cold winters here. A couple of weeks ago I started to notice rattling inside of my dashboard only when I turn on the windshield heater, and it works for 5-10 minutes then on potholes or bad roads I hear that something is jumping inside or at least sounding like that. When I turn off the windshield heater and the car gets cold again, the sound is gone. During warmer times of the year, I do not hear it at all.

What do you think? Has anyone faced this type of issue before and is there a quick fix?

Thank you so much for your help.