Do not leave garbage trucks and hearses (Cities: Skylines)

Good day
Help to understand, at first everything was fine, drove garbage trucks, hearses, too, after 60K of the population, they ceased to go, the whole town is dead and in the garbage, when you hover over the building lights up then once again 1 0. The same refining full of gasoline but do not export and are overcrowded. What to do?