A slow or unstable internet connection can ruin your Netflix streaming plan at any time. Chances are your internet isn't working properly, especially if your videos keep buffering or the Netflix icon keeps loading.
The quickest way to check whether the problem is with your internet connection or not is to go to the Roku settings page >> Network. Then click Check Connections to check the status.
If your connection is slow, go to your router/modem and reboot. Once done, reconnecting your Roku streaming device to the internet should solve the problem of Netflix not Working on Roku.