I have been seeing the same kanji for some time now. I levelled up to level 21 before Xmas, during which time I was in hospital so wasn’t able to use the app very much. However, since coming out and finally catching up with all my reviews, I haven’t been getting any new lessons. Considering the rate at which it tends to throw new words at you, finding this a bit weird. Any help??
I doubt the SRS is broken, so my guess is that you are in a very peculiar situation where you have all of your current level’s radicals and kanji in apprentice status.