Hi. An ectopic ureter is a congenital problem, therefore not chronic as such, but an anatomically genetic fault from birth. Surgery (often using laser techniques) does not always correct the problem. The success rate is lower in females than it is in males, varying between 25% and 58%. Therefore, it is likely that surgery has not corrected the problem. Your vet might try phenylpropanolamine, which sometimes improves the outcome.
Urinary infection is certainly a possibility, so it's good you are getting this checked out first.