Hi, i know this is a very late response. But it may still be of help to someone. I faced the exact issue and it took quite a while for me to figure out its mechanism. First off the ps4 eject button is not a touch button. It is a physical button that makes a movement of the metal spring inside move by a fraction if millimeter. Probably by one tenth of a millimeter. This is what makes the eject button feel like its a touch button. I was surprised and amazed by the crappy design. So basically the metal piece inside does not always touch the copper contact on the pcb board. But when you touch the eject button, the springy metal then touches rhe copper contact on the pcb. So to fix that issue i had to bend the springy metal inside the casing in very minor variations until i get it just right for it to make contact when the eject buttton is touched ( or pressed).