I have a Roku stick. All of a sudden my remote just stopped working and the batteries are good. So I can't seem to figure it out.

The Roku remote needs to re-paired with the Roku Player.
Open the Battery case on the Roku remote (Roku 4 remotes) look for a button and hold for 2 seconds this will then sync it to the Roku player.

The batteries and either low or dead, or the Remote needs to be Re-paired with the player (Roku 3 and Roku 4). Open the battery cover on the remote and look for a small button and hold it for 2 seconds, this should make it start to resync with the Roku Player.

I presume you have a box and not a stream stick.Try unplugging ROKU box.Many units have a button you have to push on remote after plugging in ROKU box,this connect Remote to ROKU box.If this doesn't work take out batteries in remote and put back in,this has to be done after you plug in ROKU box.Are batteries weak,try some new ones?

Check plug in roku stick and in electrical outlet for a good connection pull out and push back in..Their is a small reset button on ROKU,push it ,it will then show a blinking white light,if not you may have a bad roku stick.
Hook up ROKU stick BEFORE you put batteries in remote,after you put in batteries you will have to push button near batteries.
The remote should start blinking a green light this means it is trying to pair up with roku stick.If it does a purple sceen will appear on tv.Push home button remote and tv should give you a code.This code has to be entered at ROKU site link on computer.

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Check the remote control for its infrared emission. Check it with fresh batteries. Check it by pressing all the keys. You can detect the presence of infra-red emission from the remote control, using a cell-phone camera. If you wish to get more details about how to check a remote control, please visit this site. One among the posts has details about it. In some cases, the remote control might need to clean.
http://electronicshelponline.blogspot.com/
http://remotesearch.blogspot.com/
Search the site by type in this key phrase "how to test a remote control "in the "search box at the top right of the display window of the Homepage" to get the related post quickly.
https://youtu.be/wUpnETSm6_k
https://www.youtube.com/watch?v=jsSCNCW3IbQ [open and clean]
https://www.youtube.com/watch?v=Qp-l1uh-5gE [open and clean]

Please remove the battery case door and remove the batteries from the remote control.
Insert the batteries after a few seconds.
Press the purple pairing button which would be at the battery compartment to put your Roku remote in pairing mode.
Confirm the LEDs on the front of the remote are blinking continuously.
Remove the power cord from your Roku player and re-insert it to restart your Roku player.
When your Roku player fully re-starts, it will automatically enter pairing mode and recognize and connect to your Roku game remote.

Hi,

If you have a Wi-Fi Roku remote or a bluetooth Roku Remote, the remote needs to be paired with the unit first before you can control the device. To pair the unit with the remote, you can do the following:

1. Turn off the Roku player for 30 seconds by unplugging the power cord from the power outlet.
2. Once you have the bouncing Roku on your TV screen, open the battery compartment of the remote and press the purple button there once.
3. The Led on the remote should start blinking.
4. Leave the Led blinking and don't press any button on your Roku remote.
5. Wait for the Led to stop blinking.
6. Once the Led stopped blinking, try to test any button and see if it works.