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By rio mdr
#88234 I sometimes have the problem, that it doesn't wake up from deep sleep. Currently I have that effect and plugged in the device to my computer.

Is there any way to further analyze this in the serial monitor?

Battery should be enough, about 90% power left (4000mAh LiPo battery)
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By Sturgizz
#88252 Hi

How does your GPIO 0 and 2 are connected?
According to :
"The GPIO0 and GPIO2 should be connected to VCC with a 4.7k resistor in the middle. This is to prevent a so-called 'zombie-mode', in which the ESP8266-12 has trouble waking up from deep sleep."