Hey,
Campaigns are paused each day when the daily limit is reached, they are automatically unfrozen the next day.
Regarding tracking, as suggested in our thread and ToS, for accurate results we suggest using your server logs.
Adsense, Analytics or any third-party tool are unreliable tools to track traffic, unfortunately you will never get 100% tracking with it. We base our results on server logs, with the tool awstats. You can read this interesting article on the subject :
http://www.comauth.co.nz/seo-articles/google-analytics-accuracy-or-lack-thereof.html
I suggest using either Awstats or Statcounter.
All campaigns are paused daily when you've received your daily traffic, and unpaused automatically the next day.