JLink returns DLL error.

[JJK]

I am working with a custom board and the nRF52840.  I have been able to program various hex files to the Nordic chip on this board using SWD and an official Segger JLink device.  Now when I try to program the chip I get this error.

Here's the log

I've seen similar problems on the Dev site but no answers.

I've updated to the most recent version of JLink.  I've tried using the Segger command prompt and it will not connect to the device either.  Erase doesn't work since the JLink can't establish a SWD connection.  Any ideas on what to try next?

[tommy.lane]

Are you powering the board externally, or relying on the Vdd rail on your debugger?

[JJK]

The board is powered externally.  I've been successfully programing it for months now using the same method.  Nothing has changed with my hardware setup.

[tommy.lane]

Then I'm not sure. I've fried more than a couple of nrf's chips in the last year, but other than that I can't think of anything, other than simply writing the flash too many times, which would result in not being able to program the board.