some time ago I bought 2 "HiLetgo" ESP8266 (ESP-12E), one of them is used for a small solar powered weather station with a bunch of sensors.
I've set a 10 minutes deep sleep and it's working perfectly.
The other ESP8266 seems to have a problem with deep sleep.
I tried to load the same sketch as the "weather station" but with 1 minute for deep sleep, connected D0 with RST pin, it enters the deep sleep but after 1 minute I can see the blue led blinking once (it should blink when it wakes up) but it seems that is stuck at boot.
Checking with the serial monitor if I press the RST button, the ESP boots correctly (I can see some messages on the serial monitor), after the first deep sleep when it wakes up, I can just see garbage on the serial monitor and nothing else.
At that point I have to disconnect D0 from RST and reset it manually.
What should I check?
Thank you, regards.