Have you made sure to restart (turn off and on) the tablet to see if this resolves it? Also, have you tried having the tablet forget the device/keyboard, restart the tablet and then try reconnecting?
Thanks for your response!i
Restarting doesn't help. Not sure how to have it 'forget' the keyboard. It isn't bluetooth, it connects physically via 4 leads. I assume the connection is proprietary and the keyboard would have to be replace by the manufacturer of the tablet if it required replacing.