Three Dead Cows at Makapuu (2) - S2-E24
Continuity mistake: When the surfer examines the test tube in his beach shack, the level of white powder inside the tube keeps changing between shots. It's nearly full, then has only an inch inside, then is full again, etc. (01:22:00)
Answer: He was fired. He never really appreciated his character. He felt Kono was portrayed as a big dumb Hawaiian and that the stereotype was racist. He also felt underutilized. He was fired after a heated argument with the show's publicist regarding his character. It seems there's not much details given regarding the incident or the firing, so it's seems possible he upset the show's producers as well.
Bishop73
No he said something derogatory about one of the Jewish producers that's why he was fired.