Before going into your code I'd like to inquire about
These devices should not easily be harmed by flashing code.
Have you tried putting them in Safe Mode and flash some other code to "resurrect" them?
To get top nodge info about the Adafruit_MX90614 state regarding the Photon @peekay123 might be the one to turn to.
Meanwhile you could try to narrow down if it's the MX90614 or Blynk is causing your trouble be just using one of them at a time 