Keyboard bluetooth drop outs
I have a 2013 iMac (which is fine). I still use the battery keyboard (it says batteries 100%). The problem is that the connection between keyboard and computer (they are geographically close - about a foot) sometimes spontaneously drops out and I see I've missed a few letters when typing occasionally. Most of the time OK but ...... Any suggestions please?
iMac 21.5″, macOS 10.15