Hi! The continuous autofocus (eg. AI Servo in Canon-ese) works fine for my 80D when shooting in live mode. . . which is something I literally never do, always opting to use the viewfinder. I use back button focus, but once I lock focus (single-point) on a subject while using my viewfinder, it won't track it as it moves. (eg. if I focus on someone, keep the af-on button pressed, and they walk forward, it stays focused on the point where they were standing originally.) Could this potentially be a software issue or am I just a noob?