[l0jec]

We ran into a twitching issue related to using a USB hub on one of our laptops. For whatever reason, when using a USB hub to plug in an extra joystick, the thing would quickly cycle dropping connectivity with both joysticks. We only saw the issue on the one laptop and only if using a USB hub.
Note that our experience should not rule out a coding issue, but wanted to share it as you as your issue may be similar and if so, a real pain to troubleshoot.