My Priv seems to be a charger killer. I started with the stock charger which worked for a few weeks then died, wouldn't work on other devices either. Next I was off to a new (actually older) charger and that worked for a tiny bit, then died also. Finally I've been using a Powermat with adapter for 2 months (thought I found a winner) but now that's not working either. I think this device is killing off chargers one by one. What can I do?