You're not the first person that this has happened to. A friend of mine had a similar issue (consistent double taps) with his G27 after installing a LWD connector. I know that some of them require some polishing or slight modification, so if you or whoever removed to much material from the contact surface as others have said this type of symptom is probable.
I'd replace it with a factory connector ASAP.
I'd replace it with a factory connector ASAP.

Comment