Hi Novia,
Thank you for providing your Ad Unit Ids privately.
I tested them with our
BannerExample app and I was able to load ads successfully using all three Ad Unit Ids. Given that you were also able to load Ads multiple times, then there's nothing wrong with your implementation of the Mobile Ads SDK.
It is indeed wonderful if you can display ads all the time, however, I'm afraid it is possible that you won't be able to load ads at times because there might be no available ads from any of your Ad sources sometimes. The Mobile Ads SDK has no control over this and this could be considered expected behavior.
Since there's no specific issue with your implementation of the Mobile Ads SDK, if you have any further concerns with Ad serving or the performance of your Ad Units, please reach out to the Product Support Team via the following options.