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TPS54560: Voltage drop at output of TPS54560 at power up.

Part Number: TPS54560


I am working with the above device since 2 years on the same product. Having produce it last week, I have powered the device and make some measurement.

joined are pictures of the measurement. At power up and only at output, the 5V voltage is droping at less load. Making the full load, the voltage drop increase only at the output.

But waiting for at least 5min to 7min., there is no voltage drop anymore and I am getting a constant 5V at the output.

For at least 2 years, i have never seen this on the product. what could be the problem? shall I increase my output capacitor( this will also increase my inrush current)? Does the value of the capacitor at startup too small?