The phrase "continuing source" refers to something that continues or persists over time, providing an ongoing supply or flow of something. It represents a consistent and reliable origin or supplier that is constantly available. Full definition
One continuing source of uncertainty is the outlook for household consumption, although consumption growth picked up in late 2017. (rba.gov.au)
Wouldn't you like to address those issues that seem to be continuing sources of stress and frustration in your life once and for all? (ronlafleurcounsellingservices.com)
Spending on cholera goes mostly to contain outbreaks in new places, leaving hotspots as continued sources of disease. (newscientist.com)