We have a HP 6545B laptop which sits on a docking station with an external 22inch monitor connected.
This has worked OK for several months.
Now, the screen drags. This particularly happens in Excel. It is as though the screen is stuck and the text is repeated down the page. We can easily scroll right down and back up to make the screen "unstick" but it happens much of the time.
I have updated graphic drivers on laptop and drivers for monitor. Same issue.