Why did Michael Shanks leave Stargate SG-1?

Could you elaborate on the reasons behind Michael Shanks' departure from the popular science fiction series Stargate SG-1? Did he have any personal conflicts with the cast or crew? Was it due to creative differences with the producers? Or was there an opportunity that he couldn't pass up, such as a role in another project? Fans have been speculating for years, so it would be interesting to hear any insight you might have on this topic.