Former boxing champ Andre Ward tells TMZ Sports he's got a simple solution for Ryan Garcia's apparent woes ... stay off social media -- and start taking his upcoming fight with Devin Haney more seriously.
Garcia has a bunch of his fans -- and Ward, too -- concerned about his mental health ... after he spent a few days this past month posting some bizarre things on his X and Instagram pages.
Some of the posts included vows to expose numerous secrets about society .