iPhone ads stop working after app runs a while
<p>The iAds where working fine.  Then when I really tested, calling up all the different view controllers, it will stop working for some screens.</p>

<p>My app has about 15 screens.  Thus when I really debug it I go to all the screens and a iAd object gets created for all of them.</p>

<p>I noticed that if I put break points on the iAds delegate functions, they are all being called.  So if I go through and view all 15 screens, I have break points going off in 15 different files, for each iAd created, thus it seems like when you create a window, view controller, it keeps running, even if you call up another screen.</p>

<p>So I tred testing it and just calling up 7 screens, worked fine.   After I called up more the 7 screens the iAd no longer worked for the remaing screens, kept calling the 
- (void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error</p>

<p>methed.</p>

<p>Has any one else had this problem? I was thinking abut trying have one iAd object and using add and remove subview.  Wondering if anybody else had a more simpler solution 
Ted</p>
