Wireless keyboard and mouse keep losing connection Edge 92z

We recently installed 8 new Edge 92z 3414 DHG Thinkcentre desktop pc.  Originally supplied with Windows 8.0 and upgraded to 8.1.
We are having intermittent issue with most of them, where keystrokes are lost or repeated and mouse loses connection or is jerky.  The mouse issue can be fixed by switching off and on, but comes back later.  batteries are brand new in both KB and mouse and are the original Slim range supplied from new, using a nano usb dongle.  the distance is less than 10 inches for either.
I have tried updating the drivers, but they seem upto date already. I have put the nano usb dongle on a short extention as a test, but with the same result.
Any ideas?  The loss of keystrokes is driving us all mad!!  Help.
Dave

There are things to do with an issue such as this one.
1. You must ask yourself if this is a hardware issue:
Try brand new batteries, if that doesn't fix the issue then you must try this.
Best way to isolate this issue is to boot into the install dvd of your mac osx.
Why?
The behavior on the boot disk enviroment is totally different than the operating system while running from the hard disk. If you can recreate the issue there then its a hardware issue.
If hardware:
reset the pram (research it)
If the issue is unable to recreate in the boot disk enviroment but you can in the regular enviroment then you can isolate it to software issue:
Software troubleshooting:
1. Remove configuration file for bluetooth:
10.6: machd/library/preferences
10.5 userfolder/library preferences
file: com.apple.bluetooth.plist.
Reboot.
A combination of pram reset and plist removal works well. If it may help, use a usb mouse to remove the pairing of bluetooth then readd devices.

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