It could be a symptom of a persistent depression disorder, it is for me.
EDIT: I've been blocked from replying
Because lack of ability to concentrate, lack of motivation, and engaging in repetitive behaviour because it's the only thing that makes you not bored, are all symptoms of it
EDIT: I've been blocked from replying
Because lack of ability to concentrate, lack of motivation, and engaging in repetitive behaviour because it's the only thing that makes you not bored, are all symptoms of it