Maix Amigo wake from sleep won't work in some devices - AXP173 PMU

I have 4 Maix Amigos, running the same code, but one of them won’t wake up from sleep. I heard about the same from other Amigo users, some of them have the same issue, others don’t.
When it enters sleep mode, to turn on the device again it is necessary to hold the power button for 6 seconds so it will shutdown, then press again to so it finally turns on. I tried all kinds of register settings combinations, especially registers 0x31 and 0x12 of AXP173 pmu, but nothing chances this behavior in one of my devices, while in all the others the sleep work as expected. Anyone has a clue of what’s going on?