Hi Dozy! In order for the TV to run the last application on startup, both the Auto Run Smart Hub, and Auto Launch Last Application settings need to be enabled. If you continue to experience issues with this feature, please contact Samsung TV Support at:
― Phone: 1-800-SAMSUNG / Available 8AM - 12AM EST, 7 days a week
― LiveChat or Email: https://www.samsung.com/us/support/#contact_us_for_support
We look forward to hearing from you.
^Tim