Not much information has been released on why, but they seem to be parting on good terms.
A statement on their Facebook says:
‘With great deliberation and difficulty, we have decided to part ways with our keyboardist James Barney. James will always be family to TDWP, being one of the most well’intentioned people we know. Our prayers to James in beginning a new chapter with his wife back home, and our endless gratitude to TDWP fans for understanding. We’ll see you at a show soon.’