Just purchased 2 days ago to replace older Roku stick ...
1. Does not show when TV is turned on, takes at least a minute to be recognized. Old Roku was instantly recognized.
2. Picture shrinks to upper left corner & can't get back to full screen.
3. Can't plug into USB port on TV, not enough power? Old Roku didn't have this issue
4. main menu & apps shrink to almost unreadable size