Has anyone experienced this?
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I haven't - but I don't have many miles on my TCH. I don't have other rattles or squeaks either - yet.

But one thing I've discovered in my lifetime of owning Toyotas is that interior temperature extremes generate rattles and buzzes. When the interior gets back to normal temps, the noises go away. It bugged me at first, years ago, but I came to accept that all loved ones have their quirks. 'Course, if my new TCH (our one week anniversary is today) starts squeaking, I'll go through my stages of grief again.