We have some functional test stations which are validating units of ours that utilize the EM7565. As part of the validation we perform the GNSS RF Receive Path Test as specified in the AirPrime EM7565 Product Technical Specification. Occassionally we get have been getting a return for the frequency which is negative (typically around -422500), which causes the test to fail. Other measurements are in the expected range (we take 5 measurements). When we retest those units, it will usually pass the second or third time around.
Any insight as to why this could be occurring would be greatly appreciated - mostly want to understand if this is a potential FW bug that should be ignored, or if it indicates potential HW issues.