I'm now experiencing this.
For over a year my setup worked perfectly:
intel i3 NUC
Windows 7 Pro always kept up to date
Only software installed - Plex Home Theater, Firefox, flirc
XBOX One Media Remote ( http://ecx.images-amazon.com/images/I/61Pwgq%2B8xeL._SL1300_.jpg )
Last Friday I purchsed the newer 5th gen i5 NUC, installed the same W7 Pro, let it do all it's updates, PHT, Firefox, flirc, and of course now, just randomly when I press a key it goes berzerk as if I'm holding down the key.
I DID NOT reprogram or do anything to the flirc so I'm really not sure what is different between the old and new setup that could cause this. I have seen people mentioning power supplies. The new NUC has a different power supply so when I get home I'll check if the old and new are the same voltage and if so try the olde one.