Several times a day Mac Mini (mid-2011 model) with OS X 10.9.3 losing keyboard and mouse connection. Batteries are fresh, showing level between 73 and 100%. If I'm pressing power button on the keyboard, and clicking with a mouse, and about 30-40 seconds it connects back again. But this if very frustrating, as it happens several times every day for at least couple weeks already.
What could be a cure? Or what should I do to diagnose it further?