I bought a DFrobot Beetle and it worked fine for probably an hour, then it just stopped working with Windows.

When I connect it to the computer I hear the "connect" sound, then within 5-7 seconds I hear the disconnect sound again.

I didn't do anything special with it. I connected a RDM6300 rfid reader and used an example code from a library. I think the last thing I did was to change a string output message in the console.

From then on it just disconnects.
I tried to email DFrobot but didn't get a reply.

What could have caused this?
What can I do to make it work again?
The reset pin didn't work.
There is not enough time to replace the code on the board before it disconnects.

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