Logitech G613 sticky keys (keys duplicating)

[SluggerB]

Trying to fix for a friend of mine.

Random keys (primarily L, M, A, and G) occasionally duplicate inputs (you press the key and get 2 copies of the letter instead of one)

Googling led to a person saying the issue is the board flexes over time which makes a bad joint on the 0 Ohm resistors along the back of the board. So I opened the keyboard up and reflowed every single resistor. Every one I heated with hot air, nudged it and let surface tension pull it back in. I tested the resistors and they are all close to 0 Ohms (0.2 to 0.3 ish)

I also swapped out the L and M key with 2 keys that were never, ever used just to eliminate any mechanical failure.

Upon testing however, the keys still occasionally duplicate. It is working better, but still not perfect.

Any ideas?