According to the Samsung support site, there might be a need to re-pair
remote and TV.
https://www.samsung.com/uk/support/tv-audio-video/my-tv-remote-isnt-working/
I haven't found instructions on how to do it, but your TV manual should
have it in the Troubleshooting section.
I also found this advice on a different AK59 number, but it might work
on yours:
"Remove batteries and hold down one or more buttons for several minutes
to drain the microprocessor inside the remote control to reset it.
Reinstall batteries and try to operate the remote control again."
It might be worth a try.
Jim