For any branded NOW device, there are two suggestions
- Ensure the device is fully up to date
- Set it back to factory settings
If you plan on upgrading the hardware, you will need to be aware that the NOW stick is no longer sold on the website and stock is hard to come by in retailers. Which points to the assumption they are phasing it out.
You are best to either purcahse a Roku express or Amazon fire stick. The latter is my personal recommendation as you can purhcase an adapter and connect it via Ethernet.
FYI that I do not work for NOW, just a NOW customer trying to help