Hi Sue,
Please check the following to ensure your remote is working properly:
1. Check and clean the top edge of the remote. Dust or smudges on the IR sensor at the top of the remote can interfere with performance. Gently wipe the sensor area with a clean, dry microfiber cloth.
2. Replace the batteries. Weak or depleted batteries can cause erratic behavior. Insert a fresh set of batteries and make sure they are positioned correctly in the battery compartment.
3. Check for available software updates. Occasionally, remote responsiveness issues can be resolved with a firmware update to the TV. Go to: Settings > Support > Software Update > Update Now
4. Reset the Remote: Press and hold Return and Enter (center of the navigation pad) for more than 10 seconds. Then, re-pair the remote by pressing Return and Play/Pause simultaneously for at least 5 seconds, or until a message appears on screen confirming connection.
~Samsung Advisor