We have had sporadic instances of this issue for a while now with many Trackers. We use our Trackers as controllers, which are paired wireless to the HMD dongles. It usually only happens to one each instance. It is literally dead, does not turn on via the power button. I simply plug it back it to it's charging cable, wait a couple seconds for the LED light to turn on, unplug, then I can power back on with no issue - very strange and inconsistent. Is there some latched error-state that could possibly be causing this?