Closes out

This whole program is lagging, blacks out when I'm in the middle of editing, and has closed out completely on its own five times already in the passed 24 hours. I'm on a brand new computer and it keeps having me sign in when it closes me out. Is this happening to anyone else? This is frustrating! It takes me 13 hours to edit 15 pictures and I even have presets made for them!! Help please!!