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NRF52 no longer advertising or flashing led

I have two NRF52 chip sets. Yesterday, I was able to build and flash the Beacon and UART sample projects onto both of these chipsets.

After building and flashing, a small blue LED light would start blinking periodically. I could also scan for and detect broadcasted packets.

Today, for no reason that I can fathom, neither of these two chipsets are blinking or broadcasting anymore after I flash a build.

I have tried the following solutions

1) Erase and flash the soft devices
2) Reinstall my entire tool chain on a new Windows machine

Neither of these solutions worked.

How is it possible that both of these chips stopped blinking and broadcasting on the same day? Did I break the firmware or something?

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