"Our systems have detected unusual traffic" and search history that I didn't look for

Hi

I know it's an over seen question, and I usually wouldn't worry but it happened to every device in my home at the same time, we don't use a VPN.

Also my brother has some searches in his phone history (chrome so no extensions) that aren't his (mundane stuff like a corporation name, an app name and gibberish).

Finally our router restarted itself while we were trying to troubleshoot the wifi via the router website.

Should I be worried about something here?