I’ve been feeling this, wondering, as well.
I haven’t had any sales since FAB either.
Sales were coming in somewhat regularly before FAB.
I see someone on here who can’t make purchases: Nonsense by FAB
Possibly relevant.
Personally I find FAB a bit overhwhelming and underperforming.
Speed feels faster. 
Features are gone.
Visual overload increased. (Epic’s designs including Fortnite I find lack visual distinction between elements, while presenting the user with large amounts of data. A lot of data which I find unnecessary. While not emphasizing key navigation points.)