Been having this issue for a long time across various MacBook Pros (as I upgrade every new model that arrives). Typing in a forum like this. Posting a long message and suddenly, the trackpad jumps and chunks of text that I write suddenly disappear. I watch the placement of my palms on the laptop. They are not touching the trackpad. However, time after time I find typewritten text deleted because something interferes with the trackpad and the cursor jumps and deletes text. Is there some selection in the trackpad settings that maybe need adjusting? Thanks for your help.