Your best bet is to contact NOW staff directly.
This being a customer forum it would be judgement based from personal experience.
Personally I found factory resetting the TV tends to work the best. As well as unplugging the router for a few minutes.
The factory reset is the most extreme option, although sometimes unplugging the TV can resolve the issue.
Anyway options for speaking to staff are
1. Live chat, just make sure to click “chat online”
2. Email customer support, address in the below picture.
FYI that I do not work for NOW, just a NOW customer trying to help