(Reuters) -BTS, the South Korean band that spearheaded a global K-pop craze, is taking a break as a group to work on solo projects, the singers announced on Tuesday. Band member RM, speaking at the annual FESTA dinner that celebrates the group’s founding, said he had been feeling a need to explore his own work without the constant recording and performing required of BTS. “The problem with K-pop and the whole idol system is that they don’t give you time to mature. You have to keep producing music and keep doing something,” said RM, seated at a table with his six fellow band members and speakin…