If the usual fails then make it a warranty issue.
The usual are:
1. Set the date/time in the TV.
2. Use the Google DNS 220.127.116.11 or 18.104.22.168
3. Use a wired connection.
These are the usual so I've stopped supplying links about them. There's also the net neutrality issue but that's not a Samsung issue. And let's not go over why the Samsung is hit when other devices are not. Take that to Sam and the ISP next as I've heard plenty.
I see there have been a number of problems with the Samsung TV stopping to buffer. In our house we have a number of devices that stream video from Amazon Prime, none of them have a problem where they stop to buffer, only the Samsung HDTV - has anyone heard what I can try to fix this problem?