Fans of the popular music group, Kings of Leon are starting to wonder if there are major issues growing within the band after a Friday incident and Monday announcement. 

On Friday, Kings of Leon frontman Caleb Followill walked off stage during the middle of a show in Dallas.

In a fan video uploaded on YouTube of the Friday show, the incident starts by Followill saying "For the record, I'm not drunk, I'm just ... hot...I'm about to fall down over here because I'm so daggum hot."  He then adds, "I'm gonna go backstage for a second and I'm gonna vomit, I'm gonna drink a beer and I'm gonna come back out and play three more songs."

However, Followill never returned, leaving the rest of the band to apologize to the angry audience. 

Initially, in a statement after the show, the walk off was attributed to heat exhaustion and dehydration, causing the show in Dallas and a later show in Houston to be rescheduled.  

But by Monday, the issue seemed to be more serious as the group announced the cancellation of the remainder of its US tour. 

In another statement, released by the band on Monday, they added that "the US dates cannot be rescheduled due to the band's international tour schedule. Tickets will be refunded at point of purchase. Tickets purchased online or via phones will be automatically refunded. The band will resume touring in Canada at the Rogers Center in Vancouver, BC, on September 28th. That show was originally schedule[d] for September 14th."

The group's rep released a statement saying "We are so sorry to say Kings of Leon are canceling their entire US tour due to Caleb Followill suffering from vocal issues and exhaustion. The band is devastated, but in order to give their fans the shows they deserve, they need to take this break."

Later on Twitter, Jared Followill, Caleb's brother and the group's bass player, confessed that the problem could be serious.  "I love our fans so much. I know you guys aren't stupid. I can't lie. There are problems in our band bigger than not drinking enough Gatorade."

However, Jared did assure fans through multiple tweets that Kings of Leon would not be breaking up, but was just needing time to focus on family. 

If anything, fans may be happy to see the band get on with the show in Canada as reassurance when September comes around.