Try to find a point where your road is cut off. Most of the time this is the reason. If that is not the case, u should provide a few pics of your city.
I have the same problem with water and fire. Sometimes the buildings show red although nothing has changed. I’ve added additional roads in case that was a problem. I’ve done a hard boot of my iPad. Still have random buildings showing shortages. Help!
If road connections are solid throughout the city I suggest you contact EA technical support through the in game. Good luck.
Sometimes when I try to optimize my city some of my buildings complain not having fire department/police services even if moved fire/police station should cover them (building at the edge of green area but should be covered).
