Pico power consumption down to 0.02mA

I tried with another board : always the same consumption of about 1mA. But if I put all the pins as "output" the consumption is about 500uA... rather higher than your value... Have you an idea ?
The setup :

• Pico : 1.4
  
• Firmware : from Chrome IDE or from Github 1.85 (no difference)
  
• Vcc = 3.7V (GND and VBat)
  
• 4 - 5mV on a 10Ohms resistor (400 to 500 uA)
  
• 100nF Low ESR on wires to the board
  
  
  

Thank you for your answer !