Adsense Disabled my account

Adsense run by google has disabled my account for suspicious activity I hear this happens often, funny it just happened after I crossed threshold for payment of 60 pounds
I am at a loss as to why this happened I have never clicked on my own ads and last look when ads were active there were no more than 9 clicks on the last day I looked.
I have never asked anyone click on my ads or implied in any postings that people should click on an advert.
What is the problem I wonder, an appeal has been lodged and I will fill you in on the details