Because he wanted to much money and the 4-kids cast was very expensive .
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He didn't he got fired.
Probably not.
NO! Jason Griffith is currently voicing Sonikku
SEGA decided that it was time for a change, the change may have also occurred do to the bad fan reception from Griffith's time as voice actor.
Really, it depends on which show and games you're talking about. Like in the old freedom fighter sonic show, Jeleal White played the voice of sonic, but, in the new version in anime came out in 2007 on 4Kids tv Jason Griffith played his voice and also shadows. He also played the voice of both hedgehogs in Sonic Adventure, Sonic Adventure 2 Battle, Sonic hereos, Shadow the Hedgehog, Sonic Riders, Sonic the Hedgehog, Sonic Riders 2 Zero Gravity, and so on...