This is complete pie in the sky on my part: Kypros / Jerry are either of you doing any RS232 comms over the RFX9600? If you are doing some two way comms, I'm wondering if your Pronto is not clearing the buffer on the RFX with a receive() command or variant thereof. Basically it sounds like you're getting a buffer overrun.
You can hide almost anything until you have to put the drywall up!
