R&B singer Lloyd finds himself dealing with the same lawsuit for a second time -- that's because after settling the case in 2010 ... he's being sued again for allegedly not living up to that settlement agreement.

Lloyd -- known for such songs as "You" and "Get It Shawty" -- was sued by Joyce Irby, his former manager, for breach of contract. The two sides reached a settlement -- which, according to court documents, called for Lloyd to fork over $100,000 and required Lloyd to help Irby find a job. 

But according to documents filed last month, Irby claims Lloyd has only paid $20,000 thus far and has failed to find her a gig.

Irby wants the remaining $80,000, the job, plus attorney's fees and whatever else the court deems proper. 

Calls to Lloyd's camp have not been returned.