Pioneer x3850ui Won't shutdown

Check the detachable face connections and make sure the detachable face is fully seated correctly in the deck. If there are any issues with the connections between the deck and the face, it can cause all sorts of odd operation problems. Check the constant (yellow) and switched (red) power wires to make sure they are being switched on and off correctly. Some cars send a delayed switched power signal to the radio which can cause the radio to operate erratically. Other areas to troubleshoot: disconnect any factory steering wheel controls to make sure those aren't causing problems; disconnect all phones (wires and Bluetooth) since CarPlay and Android Auto can sometimes act weird.