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NRF52 device not detected

Hi, I'm having an issue with some PCBs I've designed with the NRF52832 on a module. When I first connect the board through a j-link, the device is not detected in NRFgo studio or by the command line tool. After trying for a while, seemingly randomly the device is detected and I can program the softdevice. From then on there are no issues re-programming.

The module is powered by a 3V coin cell. nReset is connected directly to the jtag connector with no pull-up. SWDIO and SWCLK are also connected directly to the jtag connector.

Any help would be greatly appreciated.

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