unity Ads are not showing after showing few ads why ?

Hi,Guys, unity Ads are not showing after showing few ads And after sometimes it start working why ? And One more question if unity ads are not coming after showing few ads then at that time can we use another Ads system like Admob.

Thanks In Advance.

Hi @shubham5577!
I had just the same problem with Unity Ads built-in service during last weekend.
After several hours of failed attempts I decided to disable built-in service and installed asset from Unity Asset Store - The Best Assets for Game Making. And problem disappeared wthout any changes in my C# code and scene. I hope it wll help you.
Best regards,