Are you logged in to youtube or just visiting? There are times I'll start something on youtube then succumb to the comfort of my recliner and wake up an hr or 2 later watching something I had no idea from whence it came.
Will it make it though an entire movie uninterrupted or does it cut you off watching it?
I don't pay if that is what you are asking so I get ads which I just delete. I usually don't watch anything that is over an hour continuous. But just leaving on it will eventually it goes to loading and shuts down.