Brave advertisements error

I live in Nigeria, I have kept at 10ads/hr, and I know it is maximum, that’s why I said if I receive at least 2 ads per hour. I understand that it depends where we stay but last month I used to receive BAT for 5 ads every hour when I had kept at maximum 5ad/hr that to from the ‘New Tab Ads’, but then from the last week of last month or somewhere that time, it stop giving BAT for the ‘New Tab ads’ which I had seen on an earlier day or any time before, and no new ads come up anytime soon {it is the the same 4-5 ads which keep rotating day by day}, only once a new ad in ‘New Tab ad’ had come and then the next time the same ad never gave BAT after it had given BAT for 5 ads even if it comes up a week later {I receive US company’s ads, so I believe there must be more than 4-5 ads to show}.