Verify that you are using the USB cable that came with your Roku player
If you are using any USB cable other the one that came with your Roku player, replace it with the one that came with your Roku player.
Try a different USB Port
Some USB ports have different power characteristics. Connecting your Roku player or Roku Streaming Stick to a different USB port on your TV may resolve the issue.
Connect power to power-outlet
Using the included power cord and power adapter*, connect the Roku player or Roku Streaming Stick to a working power outlet in the wall.
Connecting to a power outlet in the wall has the additional advantage that your Roku player will not need to power up every time you turn on your TV. This means your Roku player will be up and running faster than it would be connected to a TV.
If you are still having any low power issues after following these steps, please provide the serial number of your Roku device so we can assist further.