Apple Watch data usage

I have a series 4 Apple Watch ⌚️ paired with an iPhone 11. Actually, one of my employees does, I just pay the bill. I use AT&T & these are billed with two other phones. The phones seem to have data downloaded at certain times a day, such as, say 12 am, 3 am, 6 am, etc. However, I’m seeing mobile data d/l at odd times on the watch, typically for smaller amounts of data. I’ve talked to 2 different people at AT&T who say they are not texts, they’re “pretty sure”. One guy thinks they’re messages from, “some app like Facebook or What’s App.” The other guy thinks they are background apps being updated. I might buy that except I’m only seeing these during the day, weekdays, with the exception of a couple. Thoughts? Ideas? Suggestions? Answers? Random Jokes? 🙄🤷‍♀️🤣🤣