I have a large weather station receiver/uploader running on a mega 2560 which I have upscaled from a UNO system.
The mega 2560 runs an aurel receiver, ads3231 rtc, a bmp280, a ssd1306 oled and an esp8266(ESP01). the esp is run from the mega 3.3v pin with a 1k/1k voltage divider on the mega transmit pin.
The mega 2560 runs perfectly when powered from the usb connected to my pc but when powered from a 12v wallwart it runs for a number of minutes and then locks up with the oled going blank and the pin 13 led blinking about twice per second. there is no diagnostic code that blinks the led at that rate.
the ide is 1.8.11 and as far as I know the mega is genuine.
Has anybody experienced this problem running a mega from the power supply. I have scoured the web for a similar report but so far with no luck.