I have no idea what you guys are doing. But I hardly ever have any issues out of Roku, no matter what TV brand I connect it to.
Well... except the occasional Samsung POS. But that's every device connected to it.

Can't count how many Roku's I've done over the years. No issues!

Note: Roku has had some bad units (Roku 4, etc.) over the years. Never touched any of those, because I kept up with the community about what to avoid.

Right now the model to avoid is the Roku Ultra LT. That is a Walmart exclusive model and many people are buying that POS! It is garbage. DO NOT BUY THAT MODEL! I have seen problems with everyone of them people have bought.