I might be somebody from the early deliveries, but I'm experiencing the same.
The 30 minutes time frame seems to be somehow the edge.
Today I recognized another issue I haven't had before.
The controller is recognized by OS, but no access to OS calibration details is possible and it is not working at all in
VP. Neither nudging nor the plunger.
Before it helped to change the USB port, but shall I change it again? I used a front port before, but changed it to a rear port for final installation and it worked properly for several days or even weeks.
Haven't had the time to dig deeper, but as I haven't changed anything in hardware setup or OS settings I'm wondering why it stopped working from one day to the other...
Edited by cs2908, 18 October 2013 - 06:46 PM.