DIAGNOSIS The app's cache is corrupted, or the TV's limited RAM is overwhelmed by these memory-intensive apps.
FIX Clear the app cache and data. Go to Settings > Support > Device Care > Manage Storage. Select the problematic app (e.g., Netflix) and choose "Clear Data" and "Clear Cache." Then, uninstall the app via the Apps menu. Reinstall it from the Samsung App Store and log back in.
IF THAT DIDN'T WORK A software conflict is likely. Perform a soft reset: hold the power button on the remote for 10 seconds until the TV rebarts. If problems persist, check for a pending TV firmware update in Settings > Support > Software Update.
HEADS UP The TU7000 has a basic Tizen processor. Avoid leaving multiple apps running. Always press the Home button and close apps from the recent apps list to free up memory.