Artists that fell off a cliff

Sometimes I get baffled by artists that have a really promising start of their career, but then seem to vanish. Often there is a sad story behind this, sometimes it's not clear what happened.

In the late 90s, early 00s, Manu Chao was really popular in Europa, he was making a kind of universal music that could have made him the new Bob Marley. Bongo Bong and Me Gustas Tu were hits. Then after a less succesfull third album, he never made an album again. He occasionally releases singles that are often mediocre collaborations/guest spots. But what happened?!?

Guns 'n Roses is a very well-known and well-documented example. Band conquers the world, then implodes. This mainly had to do with Axl having a huge ego and being a total control freak, and the others having addiction problems.

Lauryn Hill conquered the world with the Miss-education of, won Grammy's, then kind of imploded with confused behavior and a badly received MTV album. Never heard of again.

Then Outkast. Conquered the world, suddenly split, and Andre 3000 'the new Prince' was repeatedly seen playing a flute in public and then disappearing.

The La's is a band from Liverpool, famous from 'There she goes' (covered by Sixpence none the richer) and a stellar debut album. The singer Lee Mavers was a total perfectionist and control freak who hated the released album and he never followed it up, though he was threatening to re-record the debut album.

The Fine Young Cannibals,second album had two US #1 hits. Then they broke up, musical differences...

EDIT: i meant bands and artists that are on top of their game or near it, the world is at their feet and then suddenly the artist disappears, or the band implodes and the members become recluses or don't go near the spotlights. I did not mean artists whose popularity fell off a cliff. Manu Chao, Andre 3000, Lee Mavers, Axl Rose in his lost period, are prime examples.