If your Roku keeps restarting, it can be due to several factors. First, check the power supply and ensure the Roku is properly plugged into a reliable power source. Loose connections or faulty power adapters can cause frequent restarts. Overheating is another common issue; ensure the Roku has adequate ventilation and is not placed in an enclosed area. Also, check for any system updates and install them, as outdated software can lead to instability. If the problem persists, consider performing a factory reset through the settings menu. In conclusion, if your Roku keeps restarting, addressing power issues, overheating, and software updates can resolve the problem.