After I spilled about 5mL of water into my laptop the keys stopped working. The next day they dried and they all work fine. Except for the Ctrl and Shift keys. On their own they work fine. But together Ctrl+Shift don't register. On the on-screen keyboard. Only one of them registers. I have tried with both Ctrl's and Shift's. Is this because of the connection between my keys? If possible please tell me how I could fix this.