i believe you have encountered a "hardware failure" which if i am correct is covered under your warranty (if you have one), and i don't believe there is a fix (other than sending it in and having sony replace the "R" button)
another option would be to take your phone apart and attempt to clean the innards of the button (which is NOT recommended, plus it's probably a hardware failure which requires replacement of the "R" button {because it broke due to so much use} and 1. you probably don't have a replacement "R" button. and 2. if you do have a warranty, you would "void" it by opening the phone (resulting in having to damage the sticker under the battery)
so if you can't do any of those you're SOL at the moment.
I have experience in
1. PSP Hacking and CFW (Medium to Advanced)
2. iOS (all models) Jailbreaking, tweaking, and theming (Advanced)
3. Android hacking, rooting, and tweaking {Xperia Play, and VZW Galaxy S3} (Medium)
4. Emulators, ROM's/ISO's/BIOS images (Medium to Advanced)
5. Helping others with depression (Advanced/Very Advanced)
6. Being someone you can talk to about anything (Very Advanced)
If you need help with any of the above feel free to PM me and I'll do my best to help.
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