I have following issues with Model - 4800X-Roku Ultra.
1. Over heating,
2. Suddenly Roku crashes reboots
3. Screen Freeze
4. Static Effect Display,
5. Audio goes Off.
Device Details -Model - 4800X-Roku Ultra.
I don't use Model - 4800X-Roku Ultra regularly, except weekends for my media room.
I have another Roku Model 4200X-Roku3, other models, which runs almost 12 hrs a day 24x7. I never had any issues with these models.