Hi,
there is no issue as an issue
I'm just going to use it within iOS app that is completely functional offline
that's why a user might guess to use the turning off net as an ad off solution
and
that's why from time to time the app will ask s/he to turn on the net if it's not
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so idea is to load adv as soon as the net appears and start every next loading immediately after showing already loaded ad
thus there might be case that the preloaded ad is shown when there is no net. I wouldn't like to show it uselessly