I'm using XB24-API-001 802.15.4 modules on the 10EF firmware. They each use API mode to talk to their own PIC18F67J50 MCU. The baud rate is 57000. One of them acts as the master and is always transmitting data for the other to receive. If I configure the radio on the one receiving the data then it will successfully receive the data and send it over UART to the MCU for further processing. However, after the device shuts off and power is cut to the module, if I start it back up to receive more data then it won't get anything useful. The only thing I get is 0xFF right off the bat, and then nothing else after that. If I reconfigure the radio then it will work the first time, but no times after that.
I have several devices that receive data in this way from a central master unit, and only a couple of the devices have this problem. Other devices work just fine and will receive data every time they power up.
Could it be that the radio module is somehow getting its configuration messed up once the power is cut?