You didn't mention who made it, but some TV manufacturers do have significantly better reliability ratings than others. Last time I checked, Consumer Reports listed Samsung as one of the most reliable which is why my old/current TV was made by them. (I haven't checked their ratings since I bought that one though.) In any case, it might be worth checking in with the manufacturer.
Just to be clear - Roku doesn't make TVs. They do make their streaming service OS available to TV makers to include - though I much prefer to have my streaming devices in tiny separate boxes that I can swap out (or not) independently of big bulky TVs.
Roku doesn't actually charge for their service either. Though you can optionally be billed for premium streaming channels through them. (Or you can pay the streaming channels directly.)
