Rantanen said the team has had trouble translating the focus from the locker room to the ice for the start of periods.
"The locker room looks ready every time we go, but I don't know what happens in the first shift," Rantanen said. "We let goals go in our own net. I don't know, it can't be like that. We have to learn about it and try and do something about it. It's the only way we're going to win games."
While Bednar wasn't pleased with his team giving up five goals, it's how Nashville scored them that really rubbed him the wrong way.
"I didn't feel that they had to work for their goals tonight. We get beat 1-on-1 twice, and it's in the back of our net," the bench manager said. "You just can't do it. We have time on a controlled breakout, we turn it over early, it ends up in the back of our net. The mistakes we're making we have to correct as a team."
Colorado finished with more shots on goal (40-33) and attempts (63-61), but most of that pressure came with the team pressing late to get back in the game.
"We play our best hockey and play hard when we get down, and that's not acceptable. Early on (we said) we got to grow and we got to grow, but it's unacceptable later on," Bednar said. "Like now we're at the quarter-season mark, we've got to cure it. They've got to cure it in the room. They've got to be ready to go as individuals. Some guys brought it, some guys didn't. You can't have passengers in this league if you're going to win."
So where does the Avalanche go from here?
Colorado will get back to the practice ice Wednesday and will continue to look for ways to replicate its good performance from training into games.
Bednar knows it is up to his troops to do it.
"For some reason in games, we have to get fired up before it starts," Bednar said. "That's not me going in and giving a speech. That's the mindset of our players, our guys getting ready to compete at a high level because that's what it takes in this business. I believe we're capable of doing that. You see when we do it, we can be a good team, a dangerous team. We can be a hard defending team, but it's got to be 60 minutes every night."