I use League Pass on Roku to watch the games. Lately, the performance has been so poor as to be almost unwatchable.
I get frequent streaming stops with a "Loading" screen. Also it occasionally just kicks out to the home screen.
I've tried different routers and deleting and re-installing the app. No improvement.
FWIW, all my other streaming services on Roku run fine.
I had the exact same problem last year, except I was streaming through my PS3. League Pass was unwatchable with constant buffering, freezing, etc. The thing is everything else I streamed on my PS3 worked fine: Netflix, Prime, etc. I tried switching from wifi to wired, re-installed the app, nothing helped. It was a miserable experience.
Then I noticed League Pass worked fine everywhere else but my PS3. If I streamed on my computer or phone it was fine.
The only solution I have is to try streaming on a computer, and if that works connect your PC to the TV (if you can). Personally, I use a steam link to do this, but a laptop with an HDMI output is a simple, easy set up too.
Unfortunately only solution I have. The NBA is really shooting themselves in the foot here, just a terrible product/service driving a lot of their customers to pirated streams.