Thanks for the note.
It's fairly normal for your device to get warm during use, but if you are seeing a message on screen mentioning overheating, there are a few things you can do to help.
For more information visit our Support page here: What should I do if the red light is on or I see a “Your device is overheating” warning?
If that doesn't seem to resolve the issue, feel free to send me a PM with your Roku account email address and the serial number of your device from Settings>System>About. I'll follow up directly to assist you more from there.