I got nervous this morning after I've opened my computer, lots of plus signs are coming out, typing on its own. I've tried to stop it but they kept on coming back so I just left my computer and take a break. Then after about 10 minutes it suddenly stopped. I find it strange. Anyway, I hope it won’t happen again tomorrow when I open my computer or else I will have to schedule a clean up computer with our IT technician before something bad happens.