why power down current shaking

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wensi

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The chip is a HDMI/DVI transmitter , one 3.3v power supply power down current should be less than 1uA, most cases it is 0.1uA , but some times the power down current shaking between 1uA and 550uA while I connect the chip with a DVI panel using a HDMI cable ,while separate the chip with the panel ,this phenomenon dissappear , connect the panel the phenomenon appear again , any one have encounted such a case before and can you give me some suggestion?

Thanks
 

Probably the transceiver and the panel has different ground potential, which causes quiescent current flow.
 

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