I have a new UE65KS8000 set and it is exhibiting a weird behaviour where button-presses on the remote control are sometimes registered twice! For example, if I press mute it will mute then instantly un-mute again. If I press up/down on a menu it jumps two places etc. etc. 

I think this must be a firmware issue, as I have had two of these sets and BOTH exhibited this behaviour (the first had another fault and was returned). 

Has anyone else noticed this? Does anyone have any info?

Thanks in advance!