@shawn0102c , how do you know it's overheating? (That's not something that would be obvious to me.).
If what Mary suggested doesn't help (removing, restarting[1], re-adding the app), you might as well try the so-called "clear cache" ritual:
Hit HOME 5 times.
UP once.
REWIND twice.
FAST FORWARD twice. (Clears cache & tv reboots itself. Be patient. It takes 2-3 minutes for the tv to go black, and come back on)
That does fix problems for people (when other things didn't). Nobody knows why, and Roku's no help on the topic.
FWIW: I don't see how your tv maker would be responsible for YouTube's inefficiencies using Roku's API. If your tv is still under warranty, I would pursue that. If not, I'd contact YouTube's app support.
The simplest solution may be to spend $22 on an Amazon Firestick Lite. Stream through HDMI. That's what I do. (I've seen others say they're doing it.). Roku does not seem serious about customer support.
[1] The restart function is in settings>system>power.
"People are often amazed at how much we’ve done with the number of engineers we’ve got." (Roku CEO Anthony Wood, Austin Statesman, Oct 4, 2019). "Amazed" is one way of putting it.
