I think it's pretty natural a decreasing interest troughout time.
Especially when you grow up with Ayu (not literaly tho lol). Maybe you cannot relate to her songs anymore, because your tastes are changed.
Things happened in my life, so I can't relate to her

~I married my dokidoki love is beautiful~

type of songs lately. So I rarely listen to LOVE again even if I loved it (I think I wrote a good review when it was released, here on AHS). I'm more in a GUILTY mood (I used to dislike that album. See how things can change?) or angst/rockish songs. Even though I enjoyed her latests songs. Especially Merry-go-round. Also, Feel the love is that kind of cute trash I could listen to when I'm bored.
I hope her upcoming EDM album would be as awesome as Party Queen was. Where Ayu can
experiment and do something new.
I'm not tired of Ayu, actually I would never lose interest on her. I'm just waiting for something like BRILLANTE. Something that make me say: this is the Ayu I know. And was the last song I truly love from her. Only snowy kiss come close, but ugh that PV. At least BRILLANTE's was weird and yay for
halfnaked hot guys.
It's kinda weird as opinion though but whatever, is how I feel

.