Hisense 55cm tv brand new with Netflix Every time I switch the tv on Netflix the code ui-800-3 shows and I have to reset Why....

If you experience the error code UI-800-3, it typically points to information stored on your device that needs to be refreshed. Could you please provide me with the make and model of your device?
Thanks
JS

this Netflix error code is common , generally many users are facing .. you can use this steps to fix instant..https://www.errorcodeexpert.com/how-to-fix-netflix-error-code-ui-800-3/

Hi Patrick,
Well, there is a standard procedure to solve this.
If you're using a:

* TV / Blu-ray player / Set-top box
Unplug the device from the power, wait 1 minute and then plug it again.
If it still does not work, log out of your account and log in again.
By now it should be working, but the last thing you can do is unninstall Netflix (if possible) and install again

* Computer
Close netflix and open again.
If it persists you can try to use another browser or clear your cache in cookies (notice that clearing coockies and cache can delete some data INSIDE YOUR BROWSER that you want to keep)

* Phone / tablet
Close the app and open again.
If it doesn't work, log out and then in.
With the error persisting try to unninstall then install the app again.

If it persists, contact Netflix at the bottom of his site:
https://help.netflix.com/en?utm_source=mediacontact

Error codes are always slightly frustrating as they don't necessarily describe what the error actually is. In this case, Error UI-800-3 means that Netflix is experiencing an internet connectivity problem. This could mean you're unable to sign in or stream content.
I would factory reset your tv, then make sure you have the latest updated firmware for it. Next re-enter your netflix details. You did not mention if you connected via ethernet or wireless. Whichever medium would be worth checking also.

Follow the link to the Netflix support website. https://help.netflix.com/en/node/46037

try refreshing of the firestick as detailed in link below
as something to try
https://help.netflix.com/en/node/12232

Netflix help center has it listed ...

"If you experience the error code UI-800-3 (205040), it typically points to information stored on your device that needs to be refreshed. Follow the troubleshooting steps for your device below to resolve the issue."

https://help.netflix.com/en/node/46037

I have the same issues, I tried everything from disconnecting the modem to resetting the TVs smart Hub, I also tried all Netflix recommendations and I am still having the same problems, please help if you have a solution