Hello
The simple thing is that just try to change the keypad (Keyboard) or connect a USB external Keyboard to make sure the problem lies in keypad if this is not the case you may check to see the power adapter might not be working properly because if power stabilization not good this type of error could arise
or you need to service the whole internal mainboard (if you have some technicle knowledge about Laptops)you may do it by yourself.
The dust fine particle may also affect the performance of laptops
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