Years ago I was referred to a urologist, due to recurring UTIs. All sorts of tests were done but nothing of consequence found, other than white cells in my urine. The lab, other than with the first UTI, couldn't find what the cause was. I was told to take a cranberry juice tablet every day, as it wasn't an old wife's tale that cranberries help prevent UTIs. I bought concentrated cranberry juice caplets in Holland and Barrett and have been taking them ever since. You could try this too, to see if it helps.
Whatever type of diabetes you have, raised sugar levels make us prone to infections . . . even when we think our diabetic control is good, apparently.