App never failed for me. Cant say the same for the device.

The app always worked for me. Unfortunately, Coin sold out to FitBit and there will not be a Coun 3.0. The problem with the device is that 1) charges fail in places that require my name data 2) more places are using the EMV Chip which this does not support. As of this review, I am no longer carrying my Coin.

thedivine1 about Coin - A smart payment device for your cards, v2.1.1