I had the same problem with R2. I fixed it. You will need some skill to disassemble the controller. The electrical contacts are dirty. The R2, R1, L2 and L1 buttons are a bit more difficult to clean than the others. You will need a small Phillips screwdriver, cotton swab and a tweezer. There are tutorials on Youtube that show how to open the controller. You need to clean all the contacts under the rubber covers. Both sides of them. The problem should be solved after that. It worked for me. I have opened the controller a few times and therefore have experience. Not recommended for beginners and if the device is still under warranty! It has two to three difficult places to put it back together....