I would look at this issue: Boron LTE Fails to Connect before purchasing any more Boron’s.
In our test of 20 Borons in the field, 3 have failed this way. We’d like to put another 40-60 in the field, but I think we will hold on that until Particle gets to root cause on these issues.
For some context, our carrier board can sit either a Boron or an Electron – we have not had an Electron failure and have similar numbers of Electrons in the field.