I've noticed that all of my L3 + when shaken with hands, make a sound of the hashboards "dancing"... some more than others (not all hashboards) ... is this normal? Are they a little loose? I made a video to show what I'm saying (maybe you need to turn up the volume so you can hear it).
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https://vimeo.com/226577873Yes, that is normal. My S9s are the same.
The case is not super tight and hash boards have some (very little) space to move.
It is nothing that should be worried about though and it is no problem.