Mac Mini 2012 cannot connect wireless keyboard & track pad after sleep

Hi All,

I think some of you may have experienced this issue when the Mac Mini wireless keyboard and track pad cannot be connected after sleep. And I had to force the computer to shut down and restart in order to use it again. The thing is, this is even after installing the update that was released in July 2015, which supposed to address similar issue with USB keyboard:

"This update is recommended for Mac mini (late 2012) models. This update addresses an issue that may prevent a USB keyboard from being recognized after the system wakes from sleep."

So I'm not sure if this affects my situation?

Here are the specs for me computer:

Mac Mini Late 2012

Processor 2.3 GHz Intel Core i7

Graphics Intel HD Graphics 4000 1024 MB

Software OS X 10.9.5 (13F1112)

Memory 4 GB 1600 MHz DDR3

Any clue?

Thanks so much!

Andrew