I don't know if this is a hardware or a software problem. My nRF52832 code runs correctly on a PCA10040 development board (UUID = E9:4A:AF:04:D2:16). My custom hardware advertises correctly but the UUID is incorrect (C9:7C:A5:8B:19:EB). The 32MHz xtal is +/-10ppm @ 12pF load. I have tried everything that I can think of including a PCB layout using a 50 ohm SMA antenna, same problem.