iMac bluetooth keyboard
overnight my keyboard has decided to play up. a number of keys don't work (i am typing this with the mouse and the on screen keyboard).
i have tried un-pairing, re-pairing, holding the keyboard on/off button to reset it, removed/replaced batteries and also restarted iMac ......but no luck.
any ideas or is it a new keyboard?
iMac, OS X Yosemite (10.10)