Yeah thats the one. I'm sure it's a technically great app, everyone raves about it, but I preferred the interface of the Samsung one. And I grudge paying someone else money for the same/similar product.Are you taking about Xplay?
Because that app for LG TVs is absolutely brilliant, ten tones better than the native app, and actually plays 4K & 4K HDR with no buffering at all, the native app is a buffering mess.
Think it’s is actually about £5 and is updated on a regular basis.
Having said that, I've been playing stuff on the LG app without fault recently. I should try the stuff that wasn't working well previously to see if there's still issue.