The Canaries let in three against Blackburn and Aston Villa.
Striker Morison said: "We have let ourselves down over the last couple of weeks.
"We have conceded too many goals as a team and we need to stop that. The one thing you take from everything is that this squad has great heart. We are never beaten.
"But if you go home happy from losing 3-2 at Villa there is something wrong."