One reason this could be happening is due to the connection between the keyboard and the tablet. The connection where the keyboard and the tablet meet could be faulty or misplaced.
Remove the keyboard from the tablet and examine the magnetic hinge in the center of the keyboard. If it is damaged, you will need to buy a new keyboard.
If the connection is not damaged, it could be an internal connection problem. Look at this [[Acer One 10 S1002-145A Troubleshooting|troubleshooting page]] for help on keyboard connection problems.