my ds4 that had the rubber wear also did have the r1 problem too i didnt know till i saw the utube vid and tried it. i ve seen and tried the fix which involves cleaning to my surprise sony have design the r1 and l1 buttons to ride/sit on to shafts after awhile the plastic to plastic contact causes small plastic dust which builds up on the shaft and in the hole of the button which then causes the button to stick.
the ps2 and 3 didnt have this design they simply floated freely and just had stops which would not let the button come out of the controller. the new design is good in that it will make the button feel more solid it wont feel loose and wiggle around like the ps1-3 but all ds4s r1 and l1 will need to be cleaned periodically
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