Shutter fires when shutter speed dial is turned

I have a Canon t3i that has some sort of problem with the shutter firing when it shouldn't. Whether I have a lens on or not, the shutter fires whenever I try to change the shutter speed using the main dial on the top of the camera, right behind the shutter release button. I've tried taking out the battery, reset all the settings and updating firmware, but none of this seems to work. Does anyone have any​ idea how I could fix this? I haven't been able to figure out how to do a factory reset of the camera, I'm thinking that might help but I'm not sure.