Most cases having to do with the keyboard, screen, volume buttons or other parts of the phone is mostly related to the flex cable. the flex cable is a thin bunch of tiny wires that are joined together and form a flat extended cable. it is most likely that your phone is suffering from a problem of either a weak or faulty flex cable which needs to be changed.
my advice is that you send it to a repairer because it is a very delicate process which requires some level of expertise. depending on the type of phone and how common it is, the flex shouln't be too expensive for a phone like yours.
hope this was helpful?
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