I am using RF module P/N XB3-24CDMUM(Digimesh) and for whatever reason, configuration change commands do not persist after POR whether made with XCTU or AT commands (via terminal emulation program). I make some changes, then WRITE (either ATWR or write button via XCTU). Disconnect and reconnect the module and it's back to default. I also have XB24 and XBee PRO 900 HP modules that maintain changes made after POR, just not this little XB3. Could there be a problem with this instance of module or something systemic I need to know?