No more phone rewards

Good morning,
For a few weeks now, I’ve been noticing that on my phone, while I’m still consulting the ads chosen by Brave, I don’t have any more Bat that register in my wallet. Is there a step to be taken or something else to solve it?
Besides, I sent 10 bat (which have been counted) on a Publisher and I didn’t see them coming…
Thank you for your answer and your attention,
Yours sincerely,
Krystof