Applications freeze and are pushed to adjacent screen

Have Lenovo ThinkVision monitor connected to docking station & laptop via plugable USB 2.0 display adapter (so as to use two screens).

When pulling applications around on monitor using the USB 2.0 device, the monitor “freezes,” pushes the applications onto another screen, flashes, and brings the application back onto the original screen.

This happens approximately 30x per day.

Please help!