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nRF52820 Not Running on USB Power

Hello,

I am developing a circuit which is based on nRF52820. I got the boards manufactured but they are not functioning properly for some reason.

Following are the errors which i am getting.

1- The BLE is not advertising properly.

2- If i blink the LED with delay of 800ms, it blinks at an interval of about 2.8ms.

3- I am not able to program the chip most of the times using SWD.

So following could be the causes of malfunction.

1- I am powering the system using a USB power source (May be my design has some flaws)

2- The 32MHz external crystal might be selected wrong part.

3- May be i am missing something on the software side to run the chip properly based on USB power input.

Please assist me if i am doing anything wrong.

Thank you

Following are my schematics. (One from the datasheet which i copied and one is my own)

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