Issues with graphics on dock + 2 monitors setup with Lattitude laptops

I have the most standard configuration imaginable. WD 19 docking station, two monitors connected via 2xDP or DP and HDMI. The problem is with Latitude series laptops with HD620 or HD630 graphics. When working on two monitors, usually when working with Adobe Reader or Internet Exlorer, the upper part of one screen is no longer active. On the monitor (left or right) sometimes a bar appears (3-4 cm height) which can be hovered over with mouse cursor but nothing is active to click. Sometimes it's now even a bar but just the affected screaan area its just unactive. You cannot minimize or close the app or check anything that's in the upper part of the screen  In such a situation it helps to change the resolution from the native one to any other and to restore the settings. Everything then returns to normal. However, it is very annoying. Has anyone had this problem? I have like 40 desks this ocsionally happens to all of them.