The fault is usually caused by the conductive film going bad. One is from wear and the other reason is from liquid damage / corrosion around where the conductive film contacts with the board.
DualShock 4 (CUH-ZCT1U) Button Circuit Membrane Replacement
There are multiple models of the conductive film so make sure to buy the compatible one. I believe there is a model / part number printed on the conductive film and logic board.
If there is liquid damage / corrosion on the logic board it’s a good idea to brush them off well with isopropyl alcohol 99% preferable with soft bristle brush gently.
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Anyone can help fixing it btw it’s model no is CUH-ZTC1E
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