Wipy 3 irregularly crashes after deepsleep

[MoeweX]

Hi,

I have been evaluating the deepsleep capabilities of my Wipy 3 quite intensively during the last days. I noticed that it always crashes after a random amount of deepsleep cycles upon which a hard reset is required.
When it crashed, it has not connected to my WIFI (as specified in boot.py) and also did not setup its own WIFI, so I cannot access the REPL. However, it consumes power as it is warm. I am not sure whether the board crashes while going to deepsleep or while waking up from it.

Am I doing something wrong or is this a firmware/hardware issue? Find below a boot.py and main.py that I can use to reproduce the problem, it usually occurs during the first hour.

# boot.py -- run on boot-up
import machine
import pycom
import time

def connectToWlan():
    from network import WLAN
    wlan = WLAN(mode=WLAN.STA)
    nets = wlan.scan()
    for net in nets:
        if net.ssid == '<SSID>':
            print('Network found!')
            wlan.connect(net.ssid, auth=(net.sec, '<AUTH>'), timeout=5000)
            while not wlan.isconnected():
                pycom.rgbled(0x7f0000) # red
                machine.idle() # save power while waiting
            print('WLAN connection succeeded!')
            wlan.ifconfig(config=('192.168.0.14', '255.255.255.0', '192.168.0.1', '192.168.0.1'))
            print(wlan.ifconfig())
            break

# Code to be run on boot-up
pycom.heartbeat(False)
connectToWlan()
pycom.rgbled(0x007f00) # green
time.sleep(1) # wait shortly

# main.py -- runs after boot.py
import time
import pycom

###########################################################################
# Constants
DEEPSLEEP_TIME = 2 # seconds

###########################################################################
print("Going to deepsleep in 10 seconds")
for i in range(10):
    pycom.rgbled(0) # off
    time.sleep(0.5)
    pycom.rgbled(0xffa500) # orange
    time.sleep(0.5)

print("Going to deepsleep")
time.sleep(1) # better wait a little
machine.deepsleep(DEEPSLEEP_TIME * 1000)  # must be milliseconds

Personally, I think the Wipy crashes after the wake up and before boot.py is run, but I am not sure how to proof that without staring at the Wipy for an hour.

[Tankfull]

@moewex I have been having the same issue. My deep sleep time is 60 minutes. The WiPy will function fine for 1 - 2 weeks, then it hits this stall out mode where it does not connect to wifi and heats up. Not sure where the issue is on this one.

[MoeweX]

As of last week, I cannot reproduce the error anymore... . If I encounter the issue again, I will write here again.