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This rattling problem is most likely caused by loose battery. I assume this battery has been fixed to the frame by double sided adhesive tape, but is too heavy and with the time detaches from frame. This trick with hair dryer is quite dangerous advice. Hot temperature obviously makes the adhesive layer of the tape sticky again and fixes the issue for a while. But since the device and the screen are made of plastic, it is very easy to damage them with too hot air and also some internal components like digitizer or flexible connective tapes could be affected.
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