nRF52840 QFAA sensitiv to magnetic flux (custom board)

Dear Nordic team,

we are facing a strange phenomenon - in idle mode (k_sleep(K_FOREVER)) we notice, that the current consumption drastically increases if a magnet is placed close to the IC. Instead of a few mA, the current increases to ~10 mA. Any ideas where this might come from? No peripherals beside a few gpios + uart are used in our design.

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