Thats common when you get used to a certain flavor at least in my experience . Try switching out to a flavor thats very different than what your currently using .
Your not getting burnt hits and no perceptible flavor at all are you ? If i have a flavor disappear i usually change my coil and more often than not the flavors back .
Oop's, just saw all your flavors are the same type , yeah thats tough.
I too mostly vape sweet custard and dessert flavors BUT I keep this VERY strong menthol for when I have colds or vapor's tongue .I hate the stuff but at those times its the only thing I can taste.It helps get rid of vapor's tongue but it is dismal not being able to vape/taste your fave juices!
Usually goes away after anywhere from a few hours to a couple of day ....
Best of Luck (it WILL come back