Lohan Problems at Coachella

Sources tell TMZ, 24-year-old Michael Lohan Jr. was staying at the Hyatt Grand Champions Resort in Indian Wells, CA -- and around 3AM Friday morning, the hotel received a noise complaint about his room.

We're told hotel management paid a visit to Michael's room after the complaint -- and the party inside agreed to keep the volume down.

But it didn't end there -- we're told someone then made a complaint about someone smoking in Michael's room ... and hotel management was forced to pay him ANOTHER visit.

We're told management informed Michael it was a non-smoking room -- and the smoker put out his cigarette.