I don’t really know what is happening but it could be a pump, or lift station problem. Florida is mostly flat so instead of gravity sewer they may need pumps to keep things moving. Sometimes the primary pump fails and then there is a secondary or back up pump with floats that are set higher. The pump tank could be over filling causing a back up but then the back-up pump kicks in and the problem goes away. You may want to call the city public works department and discuss the problem with them. .... You may have some venting issues in your home because positive air pressure should vent out the roof vents.