Morning @Kimbert, I know the ads’ frequency is puzzling at times, but it really isn’t uncommon to go a day or even three with no ads - it’s happened to me, and most others.
That’s not to say that something couldn’t be buggy, or isn’t being worked on. I think the Ads will improve as more companies choose to opt in the BAT program and Brave continues to tweak at the system.
There do seem to be a few technical issues right now and maybe this is playing around with the ads, but I really don’t know. I do know that going 3 days without ads, while not nice, doesn’t mean something’s wrong.
Sorry I couldn’t tell you something nicer to hear. You can make sure no settings have been reset on you, maybe even try toggling the Ads on/off - but I would wait till the payout process is well finished first.