Frustrated

Somethings not right in my classroom and I can't help but feel that it's me. For some reason I've lost my connection with my students. They're not responding like they used to. In the space of a few days they've totally lost interest in learning. I plan on switching back to the white board from the overhead projector but I don't know if that's going to make a difference. I'm also going to change up the seating again which may snap them out of this funk. I really need to do something or lots of students are going to spend 4 years in middle school instead of 3.