My boyfriend seems annoyed when he gives me head

Madison
So my boyfriend and I have been going through a rough patch in our relationship, but the sex hasn't really changed in terms of how frequently we have it and how good it is each time. 
Lately though, when he's been going down on me I feel like he isn't enjoying himself. He gets really lazy with it and it makes it impossible for me to enjoy head. I'd rather him just not do it than put hardly any energy into pleasing me, and maybe he thinks that if he just plays around down there it's going to feel good regardless, but that's actually it the case. 
The intimacy we used to have made it so enjoyable, but now it just seems like he's annoyed and wants to get it over with as quickly as possible. It's a huge turn off for me and I'm not really sure how to address that with him. Any ideas?