Oddly, the boot message works ok (at 115200) but as soon as my serial monitor code occurs I get garbage characters. And loading a simple blink sketch seems to work but the blink rate is faster than it should be. With a wifi sketch that connects to my wifi AP just fine with the other NodeMCU, the questionable unit won't connect. But the flashing LED that indicates it's trying to connect flashes somewhat faster than the other unit's LED before it connects.
I can easily return the questionable unit to Amazon for a replacement, but was wondering if anyone has seen a similar problem, and if there might be a fix....?
Thanks...