why do we suddenly lose interest in things we used to enjoy?

i’ve noticed this happens A LOT

like something you used to really enjoy just kinda stops feeling interesting at some point

could be a hobby, a game, or whatever and then one day you just don’t feel like doing it anymore

is it just boredom? or something with how the brain gets used to things over time? or maybe stress or energy stuff too idk

sometimes it also feels like you want to enjoy it again but it just doesn’t hit the same anymore

just been wondering about it because it feels kinda weird when it happens, and idk what is the root cause of that lose interest