The Welsh outfit have only managed to clinch one Premier League victory since lifting the League Cup on February 24.
"I don't think it's a case of us not getting up for games and being mentally drained," BBC Sport quotes Britton as saying.
"I just think we are going through a bit of a sticky patch where we're not getting the points on the board that we were before. It's not that we're mentally tired. We're frustrated, we want to put it right."
The Swans are currently ninth in the table with five games left to play.