DIAGNOSIS The TV's internal storage is clogged with cached data from apps, slowing down the processor.
FIX Clear the app cache. Press the 'V' button on the remote to open SmartCast, navigate to the top left profile icon, go to Settings > System > Reset & Admin > Soft Power Cycle. This reboots and clears cache without erasing settings.
IF THAT DIDN'T WORK Perform a 'Clear Data' on the problematic app. Go to Settings > Apps, select the laggy app (like Netflix), and choose 'Clear Data'. You'll have to log in again, but it removes all stored app data.
HEADS UP The V505-J09 has limited processing power. Avoid installing many apps; use a streaming stick (like Roku or Fire Stick) for a faster experience if this is a constant issue.