Had a bit of a rough start when testing some example sketches with the neopixel ring. After about a minute, the signal starts experiencing interference and the lights flicker and go white. I noticed that the chip on the flora was getting very hot as well. Putting my finger on the chip to draw heat away would stop the flickering, and a few seconds after removing my finger the flickering would start again. Weird. Neopixels don't like when the data and Vin voltages are far apart, and I figured that the 3.3v logic and 5v Vin may have been causing issues, but even when connected to a LiPo I had the same issues. Re-soldering and using different wires had no effect either. In the end, I think it was the Flora. I also had issues with the board not reading any analog or digital inputs on any pin but D9.

Here's a video showing the problem. Flickering starts around 0:35s. https://youtu.be/YVfH80Bu0JE