I think this is exactly what is happening to me. Have you tried previewing via WIFI/LAN? Just to know if it happens exactly like me and if this is probably due to a bug in the APK build or not. In my case, when I generate the preview and view it on the cell phone (preview over WIFI/LAN) the game runs smoothly, but in the APK, the game it has these small jumps.
NOTE: I clarify that I do not have any physics behavior attached to the objects (physics engine 2.0).