Thanks for posting in the Roku Community!
Have you tried contacting Hisense support yet to inquire further? I'd suggest starting there to see what options or suggestions they can provide. Each Roku TV manufacturer provides direct support and warranty services for their products running the Roku OS.
You can reach them here: support.tcl.com/us or at 1-877-300-8837.
Let me know if you have any other questions, and have a good day!