https://status.particle.io says everything is ok, but I was starting to suspect the same.
A short while before you posted, I moved a xenon into another room and it started blinking rapid cyan when powered on again. I went back to find another one which had not been interrupted in the same state. I reset both, plus the argon (which was pingable and breathing cyan). Now the argon is in blinking cyan, the two xenons are blinking green.
Another argon on another mesh is breathing cyan fine. I powered up the xenon that belongs on that mesh (test mesh of 2 nodes) and it also blinks green.
As a general question, is there a cloud and connectivity troubleshooting guide? I tend to use the LED status sheets in the docs and poke reset buttons until things are happy. Are there any other debugging steps people can follow or verbose output if I stick a serial cable (or the debugger) onto a device?