And as everyone's internet connection varies, some routers have firewalls and sorry to get technical here, some ISP's choice of DNS does not have all the entries, this area needs a reboot.

Changing make may not help. Forgetting the Smart TV might help and focus on good picture quality (PQ.)

Wish I had better news but I wonder if the makers thought it through. Expecting TV owners to download to USB sticks? Seriously needs a reboot.