In the 4 years I've had my WiFiRanger, the power pod has failed three times. The company has been good about replacing them - they realized they had a reliability issue. This time they said that the WiFiRanger I have is old and I need to upgrade to their Go2: $235. Not gonna happen.
If you look at the photo, the circuit board in the upper left is what failed. It is exactly a 12V / USB charger (5V power supply). I went down to O'Reillys auto parts and got a USB charger with a 12V socket (I know you can't see it well because it's camo).
After 24 hours, it's still working fine: 5V for the router and 12V (PoE) for the Ubiquiti Bullet on the roof.
I thought I'd share this in case anybody else is having the same problem.