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Opening the FTDI serial chip in the RFXCOM USB receiver and waiting for it to send data (blocking on select/read) causes lots of USB interrupts (by default every 16ms) which might prevent your CPU from entering a deeper sleep state. You can change this:

<font color="green">echo 255 > /sys/bus/usb-serial/devices/ttyUSB1/latency_timer</font id="green">

You might have to adjust any timings in code which removes duplicate events.

Cheers, Steve