Same Issue

I have a series 6150 and Netflix does the exact same thing as the OP. All the other devices in my home load and play Netflix without that issue. It only happens on the Samsung TV and it is connected via a STP Cat6 certified network so wireless is not a variable.

It didn't do this when it was new. Had to be an update that screwed it up. TV is currently running all latest updates so nothing to try now but factory reset.

Felt the need to post this because I feel the frustration of the OP and wanted to give let Samsung now that this is not a network issue but a software one and is happening to many.