I have the same problem. It has gotten worse over the last several weeks. I don't think it is the Roku, because we use Roku for several other channels, including Acorn, ESPN, VIX, Paramount, etc., but the problem is ONLY on Netflix.
We talked to Netflix and they are trying to say it is the broadband. I also don't think this is the case. The problem is with Netflix, in my opinion, and only they know what is happening. If this keeps up they are going to lose subscriptions.
In some cases, removing the affected channel and then re-installing it may help. To ensure the process is successful, make sure to restart your device before adding the channel back in. We would recommend doing this from the Settings menu by navigating to Settings > System > System restart > Restart.
No that does not work. I've had this issue for three months now. Not resolved. Considering Apple, Amazon or Google. This is very disappointing, I have four Roku devices and been a customer for ten years.