I have a samsung UE55H6400 TV. Both of the remote controls have started to lag or be totally unresponsive. The infrared on both is working and the infrared on the TV lights up when any button on the remotes are pressed.
I´ve changed the batteries on the remotes but it made no difference. I´ve tried all the tricks I know, taking the batteries out and holding the red button for 30 seconds etc but nothing has worked so far.
I had this problem with a remote for a different device and after doing a bit of research, I found out that the problem is probably with general "grime" inside the remote. If you can (carefully) open the remote, all you need to do is remove the flexible sheet with the numbers on and rub the back of this on a sheet of white paper. Hopefully a lot of dirt will show up on the paper and once it is put together again will be as good as new!