Ad Campaign: No More Impressions?

Hi there,

Recently launched my business and I have been launching a few ad campaigns. I let them run for a while and then I’ll pause the campaign and launch a new one incorporating what I’ve learned.

Most recently I launched a manual keyword campaign and it was performing pretty well, but then 4 days ago, the impressions just stopped. It still says the campaign is active, but it has stopped spending my budget.

I didn’t think much of it and launched a manual sponsored product campaign. Amazon says that campaign is active and running, but it hasn’t spent any budget and I’m sitting at zero impressions after 3 days.

I should also add that I am overbidding for most placements, so to not see a single impression over a few days is strange.

Any ideas as to what I can do to fix this?