RH: Rush Hour, NAM: Network Addon Modification, CAM: Collosus Addon
If you're using CAM, I've read it somewhere that you shouldn't use plopped building, go instead with CAM-patible buildings. But I plopped buildings, let it run for 1-2 years and CAM is still working fine. If all else fail, use cheat like radical ordinance? I use it to boost my city after 2 million, because somehow my health & education always getting overcrowded after that, no matter how large/how many civic facilities I build into the city.
Another possible solution: expand your city,zone new residential, co or industrial area. It works as a booster as well