My screen is 3840x1600. Black bars could help. I can totally see how otherwise for your type of game the infinite scroll starts to flicker on such screens.
I'm checking and it's wide but it's not wider enough to cause problems with the infinite scroll, for the scroll to break it requires a screen ratio of almost as wide as 3:1, I'm testing here and it should work fine with your screen size.
Maybe it's related to other thing like the graphic card not being able to refresh a big screen on the required rate on the canvas object, you can try lowering the resolution and checking if that solves it, are you playing on the Ouya (or other android device) or in Windows or Linux?