can you see which ads he clicking?? the same ads or different ads?? something fishy, 5 ads is quit many per head.
Like I said, I've got 12 clicks in one shot (about what I get in a week) and I didn't have a problem. Don't worry about it.
Google tends not to worry about such small amounts. I know that robots see a difference between 12 clicks per day, and 116 clicks per day, that'll send a red flag, but such insignificant figures as 5 clicks doesn't mean anything.