A problem is experienced with our nRF52840 device, which occasionally stops working and cannot be reset.
Below are the issues observed:
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The main software is stopped.
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A stable power of 3.3V is being supplied.
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Tests have been conducted with nRFConnect-SDK v2.6.1 and v2.4.2, with no resolution.
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The P0.18 is configured as the nRESET pin.
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The device is not reset by pulling down and up of the nRESET pin.
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Connections cannot be established using J-Link Segger tools.
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The issue is temporarily resolved by disconnecting and reconnecting the battery.
We have noticed the issue mentioned below, where different SDKs were used, but this did not provide a solution.
nRF52840 power-on reset failure - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com)