Yeah I think I used to have that where it would have trouble starting late, other people here with Blazervision talked about similar experiences. The NBA app for Roku is kind of glitchy, would sometimes freeze or quit or lag or other odd behavior. YouTubeTV app is simple and just works.
Haven't ever tried it on prime video as @ant mentioned - that might be pretty good as well. With Amazon taking over TNT league pass backend I was thinking that may improve next year, but using youtubeTV now it actually doesn't really effect me at all.