I've had several guys just starting out tell me about birds that gobbled good for them on the roost, gobbled on the ground and then just shut up. A couple things, he was comfortable on the roost, he flew down where he was comfortable, and he let you know where he was. There's a good chance he may be coming to you and that's why he shut up; he's coming in silent. I usually wait 10 mins or so after he goes quiet, give a nice loud yelp and then shut up again. Basically letting him come in (listen for the drumming) or letting him leave.

For me, I have birds shut up on the ground because in this same scenario, they had to cross thru a pine thicket or just a thick spot in a swamp. I have a LOT of coyotes and they don't want to be heard until they get to where they can see clearer.