Why was Raghav Chadha sacked by AAP as Deputy Leader in Rajya Sabha?

While AAP hasn't revealed why Raghav Chadha, once its key face, was removed as Deputy Leader in Rajya Sabha, several reports claimed a rift had been brewing for a few months. Raghav hadn't publicly commented after Arvind Kejriwal was discharged in liquor policy case. He appeared to distance himself from AAP after Delhi loss and focused on other policy decisions.