I came under the same realization that something environmental was effecting touch on devices at my office. It became abundantly clear something was going on after testing a Surface Pro 3 replacement today. If I lifted the SP3 off my desk or away, within seconds scrolling using touch was silky smooth. Set it on my desk, then I experienced jerky, erratic and sometimes unresponsive behavior.
I started unplugging things one by one to see what could be causing the interference. Turned out to be an LED table lamp on my desk. Even when the lamp was off, it still caused problems. Probably because the AC cable ends with a small block, like a cell phone charger, with a red light that's always on.
Come to think of it, when my iPhone went crazy recently, where it dialed someone and then kept hitting the speaker button over and over on its own, it was right next to this lamp.