All Particle Electrons in listening mode

Hello, I am working with three particle electrons that have been very consistent and reliable, however they suddenly today all went into Listening Mode at the same time (fast flashing blue).I tried to reset them, and they begin by breathing white, then go back into listening mode. I’ve also checked and I am not anywhere near my data limit, but I upped it to 10 MB just in case. Anyone else come across this problem? Could it be a network issue? (I checked the networks status but it is reporting operational).

@ParticleD, or @mstanley are you able to assist?