Ha! I think it may be my google video library trying to get me to re-authenticate my chromecast device. When I get home I'll look a little closer at the UI an

Ha! I think it may be my google video library trying to get me to re-authenticate my chromecast device. When I get home I'll look a little closer at the UI and see if there are any security related messages. thx to @politelemon and @not1ofU for your suggestions. Crossing my fingers it stops the auth spam and that it really was google sending the messages.