Anyone have a cat that has had a UTI?

Adopted our fur baby about a year ago, she had just turned 4, now she’s about to turn 5. A few weeks after we got her she started peeing outside her litter box, took her to vet, it was a UTI, they treated it. It’s been about 10-11 months since then and she has been peeing outside her box, so I made an appointment. A lot of my family has cats and they’ve never had this issue, should I be concerned that this is linked to something more serious? :(