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erratic touchpad when AC charger is plugged

Hi guys! i have a strange problem with my inspiron 14 N4050. When I plugged in the AC charger, the touchpad does not work properly. Sometimes it moves and sometimes not eventhough I have moved and touched the touchpad. When I disconnect the AC charger and reboot the system, the touchpad works perfectly fine. Can anyone give me advise on this? thanks in advance


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