The Pacers were beaten 103-77 by the San Antonio Spurs on their home court, their worst defeat of the season at the Bankers Life Fieldhouse, and they finished March with nine defeats from 17 games.
Hibbert claims that the team are not sure what the problem has been in recent weeks, but suggested that they may consider meeting with their performance psychologist, Dr. Chris Carr.
"It's awful, we've been in a downward spiral and we've been splintering a little bit," the 27-year-old told reporters following the loss to San Antonio. "We've had plenty of players-only meetings and plenty of sit-downs as a team with coaches and we've had some upper management in here, so I don't know.
"Maybe we should all go to group therapy or something, sit down with Dr. (Chris) Carr and figure out some of our grievances."
Indiana have seven games remaining in their regular season.