https://devzone.nordicsemi.com/f/nordic-q-a/4444/slow-programming-and-no-warning-for-failureAll of a sudden my jlink cortexM is taking a long time to program my nRF51822 on the devkit board. It used to be a few seconds, and now, out of the blue, it takes almost a minute and even then sometimes it hasn&#39;t actually programmed the chip. (it willen-USTelligent Community 13Thu, 13 Nov 2014 09:19:33 GMThttps://devzone.nordicsemi.com/thread/15784?ContentTypeID=1Thu, 13 Nov 2014 09:19:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1eb115f4-fc55-45e9-8986-cc5328cc2990Asbj&#248;rn<p>It could possibly be an issue with USB on you virtual machine. I&#39;m glad you found a fix, even though it&#39;s not an ideal fix.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/15783?ContentTypeID=1Wed, 12 Nov 2014 19:25:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:38e89082-1a1e-42e1-8ca3-10775492f5d0nargetdev<p>I restarted Windows (a virtual machine running on mac) and now everything is copacetic again (less than 5 seconds to program chip). I guess that&#39;s the solution..</p><div style="clear:both;"></div>