Help Lee

[discoducknc01]

I have a galaxy s tracfone from straight talk and about a month or two ago the screen started jumping and it keeps trying to to connect to usb even though its not plugged into a computer and after a while the status bar crashes. Once the status bar crashes the screen stops jumping. The only way I can turn it on is to plug it into the charger otherwise the battery icon keeps trying to refresh I've tried a factory reset and it didn't fix the problem. Any ideas? model number sch-s950c(gp)