@Anonymous User
What device are you using to watch?
Have you tried deleting the app and installing it again?
It is worth trying to put the device back to factory settings, this can often squash any bugs in the software.
If that all fails, head onto Live chat.
https://help.nowtv.com/article/how-to-submit-a-complaint
Make sure to click "chat to an advisor"
FYI that I do not work for NOW, just a NOW customer trying to help