Diagnosis
The TV's internal storage is clogged with cached data from apps and updates, a common issue with prolonged use.
How to Fix It
Free up storage. Go to All Settings > General > System > Storage > Internal Storage. Select 'Cached Data' and clear it. Then, go to 'Apps', review the list, and select any apps you don't use—choose 'Delete' to remove them entirely and free up more space.
If That Didn't Work
Perform a memory optimization. Hold the Settings button on the remote for 5+ seconds until a secret menu appears in the top-right. Select 'Memory Optimizer' and run it. This forcibly closes background processes.
Heads Up
Avoid using too many live widgets on the home screen (like the weather or sports ticker). Each one consumes RAM and slows down the interface. Edit your home screen to keep it minimal.