Wednesday night's 1-0 defeat to 10-man Bournemouth involved an incident when a Wolves goal was disallowed for an off-ball action involving Cunha.
"It is hard, many times we have lost points to a hard decision and many times we see some things on the TV and they are always sorry but the next game it happens again," Cunha said in post-match broadcast interviews.
"It's not today, maybe today they gave a good decision I don't know. It's hard on the pitch because the speed of the action is different and then you see in slow motion and you change your mind.
"Then I speak with the guy and I don't know why he goes to the screen. These kind of things, from the bottom of the heart, it's hard.
"Everyone said Wolves would go to the Championship to be relegated. We came here with a lot of work. But it is hard to lose a lot of points with hard decisions. Sometimes it feels like it is not fair."