My wireless keyboard keeps losing connectivity for a few seconds but then connects back fine. This happens sporadically so I can't figure out if something particular is causing this. This will happen several times in a row over a short period before connecting and staying connected for several days. My wireless mouse never loses connection. My wireless keyboard is located right in front and slightly below my iMac. I'm running Sierra with the Apple wireless keyboard. Keyboard has new batteries and shows 70% charged.