The Knicks’ fourth-quarter struggles reared their ugly head again Sunday against the 76ers, when they entered the final 12 minutes trailing by two points before losing 125-109. Tom Thibodeau’s crew even led early in the fourth quarter and then was down 106-105 with seven minutes left, only to muster just four points the rest of the way. “Our togetherness down the stretch is not good enough,” guard Evan Fournier said after the loss. “By togetherness I mean we are not tied together enough. Down the stretch, like I said, we have no confidence, so we are second-guessing at times. It should be second nature — boom, boom, boom, this is what we’re doing. As long as we are not doing that, it’s going to be hard to close out games against teams that are good. “It keeps happening and that’s what’s so frustrating.”