The original Apple headset microphone also has in addition to the remote control. I suspect that this remote control otherwise makes as the micro-short to close. Accordingly, I believe that the micro of my headset is so sensitive that it With high loads the same as a short circuit. Or. Clipping / overdrive.
Conclusion: The jack adapter works unfortunately only with disturbances. By random remote control commands are executed as soon as the microphone is used. This of course refers to the tested hardware from me. Basically, however, it can occur with any other hardware.