Did you check all possible channel locations? You should try posting while the game is actually on so the rest of us can take a look as opposed to waiting.
Did you look on any of the other channel locations by chance? Like the 90's or elsewhere? It is kind of hard to troubleshoot or resolve after the fact though.
This keeps happening. Every single Laker game, the game starts out in SD and then suddenly switches to HD at some point.
FSN HD West is supposed to be a permanent national channel, so this is just goofy. I don't know who is at fault, but it's very very frustrating. I've been watching Laker games at my parents house on cable just to avoid this bizarre problem.