Electron: unexplained data transfer between cloud and fw

I am trying to be very sensitive on the amount of data I collect from my electron-based unit, and if I think I have almost everything under control, here is the question:

From time to time (and without any particular activation from my part), the number of exchanged data increases significantly (see the graphs below):


As you can see, all communication remains steady for days, then all of the sudden, I observe a change, then returns to steady communication.
What happens between the ‘cloud’ and the ‘FW’ of the electron that consumes so much data ?

Random guess: due to connection issues, it has to retry a lot, causing more data usage(?) Is this something that’s repeatable, or is it a one-time thing?

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I don’t have enough data to be sure, but it seems to occur once a week around midnight PST.