Does your bunny ever do this? Mine will rattle his x-pen and pulls himself up it to get my attention when he hears me around, so I usually open his door so he can come out but, he just runs all around his pen then lays down and watches me. If I try to close the door he gets up and grabs onto the door with his front paws like “NOOOOOOO, MOM! LEAVE IT OPEN!!!!!!!!” so I leave it open and he lays back down!
I usually give him the chance to run around in the morning, he will do it for about 10-20 mins then go back in his pen and go to sleep for the day. Then at night I leave it open for a few hours while I watch tv or use the computer and he will come out eventually and run around for maybe 30 mins then go back in his pen and lay down where he can see me.
Sometimes I feel guilty he doesn’t get as much exercise as he should but…… he is the one that wants to be in his pen all the time! It is a big cage (it could fit almost 3 full size cat boxes) with an x-pen. I think he just likes having the option to leave if he wants. 