Octomom Dropped By Manager

Sources close to Nadya Suleman tell us, it's all because Octo was the ultimate flake -- her management team would book her on paying gig after paying gig ... and Nadya "would find any reason" to cancel last minute ... often claiming she couldn't find a babysitter.

We're told Octomom was great the past year -- raking in lots of dough through appearances and different celebrity events -- but getting her to work the past couple months has been like pulling teeth.

By the end, we're told it was nearly impossible even to reach Octo by phone -- and her managers had just about enough ... so they dropped her this weekend.

We reached out to Octomom's now-former manager Gina Rodriquez -- who replied, "I quit on her because she is unmanageable. She would not reply to anything work-related we would call or text about especially if it was not paid."

Gina added, "Regardless of the $70k we made her, she still claimed to not be able to pay any of her bills. We no longer wanted a part of any of it and we feel sorry for the children."