focusrite scarlett solo

So I have this problem with my scarlett studio, it works great but whenever I so much as bump it or pull on mic/headphone cable it will mess up whatever I'm doing. So if I'm in fl studio it will freeze it up, but it becomes normal after a second or few so no big deal, problem is I use the same...

I currently have a set of studio monitors and a pair of headphones hooked up to a Focusrite Scarlett Solo (2nd Gen) audio interface. (PC > Interface > speakers+headphones) The issue here is, sound comes out of both the headphones and speakers simultaneously. I have to unplug the speakers' RCA...