I have been thinking about the same thing CADCOP replied. That was a problem a few version ago, however I have had some similar experiences in recent versions. I always change my Workspace.Preferences>input-Click Sensitivity to Slow, It always fixes any problem. You may think you are to fast for a slow click sensitivity but I can promise you that you are not. You will not notice reduced performance. Give it a try. Maybe it will help?
