Simcard data transmit

[ScruffR]

There seems to be another user seeing a similar thing

High cellular bandwidth suddenly

I have two Electron-based devices that have been in the field for months. They normally use 5-10 MB per month of bandwidth. However, both were paused today for supposedly using ~85 MB of bandwidth in the current month (since June 20th). Any thoughts on why things would change so radically? They are both running 1.5.1 and the same application code that has not been problematic in the past.