IPS detection statistical...

When checking my history today I found that the IPS detection from last evening said the the offender was https:mailgoogle.com/mail....  I was doing email when I received a message from Google saying that I was being signed out as someone else had signed on.  I am the only user of that account.  We are on wi-fi at the rv park where we are.  Could this be a problem or is it a glitch?  I also lost the Norton Icon in the notification area.  I wanted to check the history at that time and could not access Norton through any program.  It is now back in the toolbar.  Should I be concerned?  Thanks for any help; I'm still new to the whole computer thing, using mainly for email.:smileyhappy: