Collabro won Britain's Got Talent in 2014 and were quickly signed up for a record deal.
They released two Top 5 albums and went on tour but last year lost one member of the group when Richard Hadfield decided to quit.
Collabro's Jamie Lambert said this weekend: "I think it’s common knowledge that there was tension within the group.
"But the four of us get on well outside of the band and we all hang out more now and rehearse at one of our flats with a keyboard and drinks."
Michael Auger added to The Sun newspaper: "When Richard left last year, we didn’t know whether to get a new member, quit or keep going.
"There were so many questions. In the end we thought we’d give it a go as a four, so we spent a lot of time re-working the harmonies to get the sound right."
The now four piece left Simon Cowell's Syco record label last year but have bounced right back with a brand new album on their own label.
"We've had a bit of a break, gone away and we feel that this album we've come back with is our best one yet," the group said on ITV's Lorraine.
They went on to talk about recording and releasing the album on their own: "It has been brilliant, there's been so much freedom, we've had full artistic control.
"This is the first album we've done which reflects what we did on BGT which was musical theatre. We've included all the song son Les Mis, Wicked, Funny Girl and Collabro-fied them."
Collabro's new album Home is out now.
Britain's Got Talent will return to ITV later this year for its eleventh series.