My ASUS transformer sometimes can not detect the keyboard dock

How can I repair my transformer sometimes can not detect keyboard dock? I already deleted the keyboard driver and replaced. If I use the troubleshoot and check status it’s always ok even if it’s not. When it’s working there are other problems like Some keyboard keys won’t work, sometimes there are continuous beeping sounds, sometimes a character will automatically types continuously…as if my transformer is evil possessed and needs to be exorcist. I already went to several technicians and no one can repair it. I have better luck in repairing it but the problem is….the problem comes back.