I have had this problem for some time, the pointer randomly migrates to one or other of the corners or to the dock or the sides then slides to a corner or disappears for a few seconds before before reappearing, usually in the top left corner. As a leisure user this is only a minor annoyance to me. However my grandchildren play timed games/puzzles/exercises and the find this problem to be extremely frustrating. I think it may caused by a program that i have inadvertently downloaded. can anyone offer any advice? Thanks.