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IphoneExpert's reply

Unresponsive keys or keyboards not working and camera lags are one of the most common problems in Samsung note 9, it has been also acknowledged by the Samsung team 

Solution if Samsung keys not working

this problem persists if your phone is overheating, try getting it cool keep it in standby mode for a while and check whether the keys responses like normal. if not it might be a hardware problem and needs to replace the devices immediately if still under Samsung warranty. 

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