No ads on Android for longer then two months

I don’t get any advertisement anymore on my android-device.
Settings are still on 5 per hour, but since more then two months, there wasn’t delivered any advertise.

What’s wrong with it?

In the beginning i got some, but only to my current amount of 1,25 BAT

It’s like magic, in the last 3 days I got “two” ads. The first ads since month.

Far far away from 5 an hour, but I got some.
Are there known issues with Brave Rewards on Android devices?