West Ham United have had a tendency to fall behind in matches this season, and gave Sunderland a two-goal head start in their latest outing.
Although West Ham were able to claw back that deficit and claim a point at the Stadium of Light, Collins acknowledges that Bilic's side need to shake an unfortunate habit.
"We've spoken about it," the central-defender said. "Certainly at Sunderland we weren't at the races. The gaffer has put his point across to the lads that he wasn't happy at half-time.
"We performed second half and got a point. But we've done that in the home games too, we haven't started right. He's spoken about that.
"It's something we're looking to sort out - we're scoring goals but at the minute we're conceding a few too. The point is that we can't keep giving teams goals and starting slowly. You can be two, three goals down within the first 15 minutes. It's more about mentality and coming out of the blocks firing."
Despite West Ham's habit of starting slowly, they have still managed to piece together a promising opening to the 2015/16 campaign.
The Hammers are unbeaten on their travels, picking up maximum points from visits to Manchester City, Liverpool and Arsenal.
Bilic's side have attacked with creativity and pace, and have caused problems to every opponent placed in their path.
At the moment, the Hammers are sitting in sixth place in the Premier League table, but they are only four points adrift of Manchester City at the top of the table.