Peter Grainger 0 Newbie Poster

From time to time screens will suddenly change focus. For example you could be in MS Word and the screen jumps to Explorer. Or you could be scrolling through a long document using the scroll wheel or scroll bars the focus will suddenly change back to the top of the document.
This happens to several users on our network and is apparently completely random. Can anyone provide any suggestions for this really annoying event?
I am aware that the proximity of Bluetooth devices can affect certain types of computers/monitors, but we do not have any on this site.

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