Left bumper button works intermittently and sometimes not at all.

How can i fix this problem without breaking the controller

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I've been having the same problem for about a year now. You're the first other person I've seen having the same issue.

In addition, I've tried changing the rubber pads of the bumpers and triggers and cleaning the contacts with alcohol. On the software side, I've tried every single FW version, using both BT, 2.4G and USB on multiple devices / OSs (Windows, Linux, Android). None of these have fixed the issue though.

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