Huge current consumption due to setWatch() ?!?

Hi everyone, I had to work on other projects so I haven't had much time to investigate further, sorry for that. I'm back on that issue since a few days and I have new info :)

I flashed the same code on the nrf52832 dev kit, made by Nordic. So no pull-up resistor that might act weird nor manufacturing problem. However, I have exactly the same issue : the dev board draws more than 7 mA when programmed.

I manually copied-pasted my code function after function to see when it starts to draw 7 mA (it draws about 1.5 mA when connected with BLE, 0.5 mA in low power mode, so no hardware cause). I discovered that the current jumps to 7 mA when the free memory goes below 1300. Here is what I tried. I run espruino 2v01 for the record =)

// I just copied-pasted my code before that lign, to fill the memory. The board draws about 1.5 mA up to now
>process.memory()
={ free: 1302, usage: 948, total: 2250, history: 1189,
  gc: 0, gctime: 3.47900390625, "stackEndAddress": 536924016, flash_start: 0, "flash_binary_end": 390268,
  "flash_code_start": 442368, flash_length: 524288 }
>var aa = "test"
="test"
// it starts to draw more than 7 mA right at this moment
>process.memory()
={ free: 1300, usage: 950, total: 2250, history: 1192,
  gc: 0, gctime: 3.47900390625, "stackEndAddress": 536924016, flash_start: 0, "flash_binary_end": 390268,
  "flash_code_start": 442368, flash_length: 524288 }

So the problem is definitly not on the hardware side. It thus seems it's a memory issue and finally not a setwatch issue. Did somebody have the same issue ? Any idea how to fix it ?

Thanks for your help :)