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CC1200: FSCAL

Part Number: CC1200
Other Parts Discussed in Thread: CC1201

Hi,

On about 50% of the parts, when performing FSCAL in temperature region of +70C to +80C, the devices become intermittent (communication).
When the ambient temperature goes above 80C or below 70C, devices go back to normal operation.  If we do not perform FSCAL, this problem does not occur: devices work perfectly fine to >+90C.

We tried using different PPM crystals, as well as a precision external oscillator (outside of temperature chamber), with same results.  So seems like using the internal oscillator or not using the internal oscillator does not make a difference for this issue.  To reiterate, there is no reference (40MHz) frequency drift when this issue occurs.  What can this be?  Does this indicate a defective CC1200 device? Thank you!