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AD9371 ADC I/Q imbalance

I am using AD9371 in my custom board and there is a problam.

When using AD9371 to receive a 1Mhz baseband single tone signal, the amplitude of in-phase and quadrature are sometimes imbalance. It seems more likely to appear in 350MHz or 4800Mhz RF frequency and less in 2400Mhz.

I tried to readback the status of QEC and it is always pending. 

So why is this problem and is this related to the RF frequency?

IQrate is 122.88MHz and rf_bandwidth is 50MHz. Thanks.