LX-5 ISO Button Stuck

My Lumix LX-5 recently developed an issue where the button for changing the ISO (the button to the right of center) gets stuck, and the ISO just repeatedly changes. As this button is also used to change almost every menu, having it work correctly is pretty important. It no longer "toggles" top to bottom, i.e., it's not acting like a rocker switch anymore. At least, it doesn't feel like the other switches. I've tried digging a business card in there in the hope of loosening it up, but to no avail. Contact cleaner has no effect. Would anyone know of a relatively easy fix for this? Sending the camera for repair would cost more than it's worth right now in 2017, but I'd love to continue to use it.