Homemade RFBee Reboots randomly

Hi Guys!

I build a RFBee board with an atmega 328 (3.3V@16MHz) and the CC1101 chip! It was build for 433MHz and has all the necessary components placed just as described by the TI’s AN for 433MHz.

The boards are sending and receiving well enough, but randomly they reboot and I can’t understand why! Does anyone had this problem?

Will it have something to do with software? or hardware?

Regarding the SPI lines, should these be handled with extra care, like 100ohm impedance or something?!

Best Regards to you all!

Suggest you run 8MHz at 3.3V.