ESP8266 Community Forum

This may sound elementary, but have you tried periodically clearing the system watchdog counter?

i tried but it didnt solved. here is some bootlog. its freezing after last garbage line.( 153 minutes later after first data send)
it seems nodemcu booting "boot mode:(3,6)" mode before freezing.

I do have the issue too on my ESP-01 board.
It works for about 20-30 reboots, then it hangs there in bootloader mode.
Pulling GPIO0 either high or low strangely results in bootloader-mode for both configurations, when let floating, the chip boots into nodeMCU. Any ideas?

Same here after several 10 deep sleeps, captured this in zombie mode with off-the-shelf NodeMCU 0.9.5 build 20150127

MEM CHECK FAIL!!!\r\n
Fatal exception (29):\r\n
epc1=0x40222788, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000044, depc=0x00000000\r\n

Checked the pins with an oscilloscope. There is a heavy (voltage > Vcc) 1kHz oscillation on the GPIO0 pin in the error case.

That signal is always there when booting but in the boot-ok case it disappears after about 100ms.