I got an ESP32 DevkitC V4 board for development that ran for months without any problem. But some weeks ago it started to not boot properly on RESET pressed, but fell into the notorious
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rst:0x10 (RTCWDT_RTC_RESET),boot:0x33 (SPI_FAST_FLASH_BOOT)
flash read err, 1000
ets_main.c 371
ets Jun 8 2016 00:22:57
I have an ESP-prog attached to it that I always have used to flash firmwares. If I will press RESET on the ESP-prog, the ESP32 does react as expected, the boot is continuing without an issue. But as soon as I will use the RESET button on the DevkitC board, the boot loop will start over.
For the time being I can continue resetting the board via the ESP-prog, but that option of course will not be available with the boards in the field....
I already checked the power supply (a 5V/2A one) and wiring and found no fault there.
Any hints what may be happening here and on how to solve it?