@Anonymous User
Welcome to the forum.
Do you have your box on a hifi shelf or something similar? I know I have a problem with the remote needing to be pretty much straight on to the box for it to register properly, and often have to do some stretching to make sure the remote is pointing straight at it.
Others have reported no problems however so it could be an issue with reflections or obstructions. However you might want to try angling the box so that it's as near straight on as you can get it, see if that improves things.
Also, if you have an Android or Apple phone/tablet you could download the official Roku app from the relevant App Store and use that to control your NOW TV box. Some people prefer using this to the included remote.
If things still appear slow or frozen using the Roku app the issue may be with the box rather than the remote.
