I'm just seeing this thread now. I've had a litany of settings (email alerts, apps, etc.) randomly reset on me as well. Glad to see I'm not alone! Hopefully, 10.3 fixes the bugs.
Happened to me about a week ago as well. A bunch of system settings were changed! Ring tones, message tone, etc.
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Same for me too. Wtf
Not really. I just noticed many settings changed. Ringer, message tone, battery percentage and many more! Weird. Only on my iPhone 7+. iPads remained unchanged.
All of the above have been happening to my iPhone 7 256gb as well. Battery percentage gone, YouTube acting like I'm running it for the first time, bank apps, insurance, etc., forgot all login info