I am able to toggle D4 high and low using AT commands successfully a few times, then eventually I start getting Status of 1 Error returned, and the default setting for D4 resets to SPI MOSI (1). At this point, I am unable to change the state of D4 using XCTU or AT commands. Any thoughts? This is occurring in a network of 7 Xbee Pro 900hp configured with Digimesh XBP9B-DM 8074 firmware.