Within 10 minutes I have had my core completely stop after flashing new code on it.
The code is nothing special, reads an analog pin, does a bit math, then sets a pin high/low depending on the read value.
When pressing the flash button it starts flashing cyan, then flashes a bit faster, then stops flashing followed by nothing more at all. Re-connecting power does nothing, reset does nothing, only thing I have found that will bring it back alive is factory reset. But doing that every 3rd time you flash new code quickly become annoying.
Any ideas to where the problem can be?