iMac update causing bluetooth keyboard not working

[twinkletwinkle]

After OSX update to 10.11 (El Capitan) my iMac blue tooth keyboard has stopped functioning. It takes 20 seconds or more recognise the key clicks. This only happens when both mouse and trackpad are also connected. As soon as I switch one of them, keyboard starts functioning normally. Please anyone help me resolving this situation or anyone else having this issue?

 

[xgman]

Try un-pairing everything, cycle bluetooth off and on and start over.

 

[Michael Kummer]

After OSX update to 10.11 (El Capitan) my iMac blue tooth keyboard has stopped functioning. It takes 20 seconds or more recognise the key clicks. This only happens when both mouse and trackpad are also connected. As soon as I switch one of them, keyboard starts functioning normally. Please anyone help me resolving this situation or anyone else having this issue?

I have started seeing Bluetooth issues towards the end of the Public Beta cycle of El Capitan that not even a complete re-install could solve. I have documented my troubleshooting steps up to the point where I had to get my iMac's antennas and AirPort card replaced here: http://wp.me/p2k0f3-ftP

Cheers
Michael