Every Gloriads blog article tagged Troubleshooting.

Sponsored Products and Display ads stop on their own when a product is out of stock; Sponsored Brands keeps spending. For FBA, FBM, KDP, Merch and vendors.

No impressions on a Sponsored Products ad? The 7 usual causes: late data, a status, the lost Buy Box, an ineligible product, a low bid, narrow targeting.
Gloriads runs your Amazon Ads by rules you control, on all four ad types.