No More Ad Drones?

A day or two ago I got an ad drone, which froze the app after it was done; before I could collect the reward.
Ever since that drone, I have had no more ad drones - all regulars.

I’m playing online in the Leaderboard and on Shift, and still can’t get any ad drones to make grinds a little faster. Happening to anyone else? Or is there a way I can get them back?

Update: Seems to’ve been fixed, or fixed itself, after a couple of days.
Watching ads for boosts is back.