But now if goes to a blue screen with an HDCP error very often

With no blue screen or HDCP errors!

Been enjoying it for a week up until today, staying get hdcp error, I have 4 Roku stocks only have that problem with this model and my TV is relatively knew and 4k

It only detected 1080p during setup, and It gave me the purple HDCP error when trying to stream anything and everything

No matter how hard I tried, or what I set the Roku to for display (tried auto, 720 and 1080) it would bring up everything fine, menus, channels, etc....until it tried play video, in which case, it would purple screen with an HDCP error and emit a loud tone from the TV requiring reboot.

Some people are complaining about HDCP errors.

I have an excellent a/c wifi router, which is a large part of a Roku or any streaming players ability to stream today's high bit rate action videos.