Here is a solution instead of waiting for updates..
Download 8.0.0.version from external site...Search for it...Download and side load to firetv stick...Install and enjoy Netflix...
So no issues...
We in FTS 4K facing issues after updated to 7.2.5....Sadly either other users doesn't have issues or not posting here... I have updated to 8.0.0 after got issues..
As soon as u posted the update method I kept FTS switched on and switched off TV...It worked ...The latest updates updated and even auto installed...I got back the latest Home version which I lost while reset... prime video version didn't got update....Thanx again...
This how a forum works and should be worked like this only....Remembered my old days of forums...Every member should share his issues and how he got solutions...