BLE can advertisement,but not to be connect?

[sheng]

I use same SDK to program the 1.nRF52_DK borad (on broad chip 52832) ,and 2.external program borad chip 52832.

Have a issue, 1.nRF52_DK borad is success to advertisement and connect, then 2.external borad is can advertisement,but not to be connect.

I use nRFConnect App tools.

Is may be hardward issus? Beacause I have a hardware version A ,it's no addition any component around to chip 51832.
And Another hardware version B,I have just addition the VDD capacity(10uF) and DEC4 capacity(105).But same issus,that can advertisement,but not to be connect.

[Matt]

Can you add some tracing code (eg. Segger RTT) to the external board's image to collect some debug info?