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ADP5300 Low Output impedance

After mounting ADP5300 on the board, the output impedance of 10 ADP5300s were all over 0.5MΩ.
But the output current gradually increased for several days, we cheched the output impedance of ADP5300.
The output impedance of the four units was as follows.
0,45,75,200ohm.
The remaining six units maintain a high impedance which are not operated so much.
Could you show us the probable causes and how to use it?