I suggest that you add a cranberry pill to your daily routine or drink cranberry juice regularly. This works for some and not for others. You just have to try it out.
I also suggest adding a pro-biotic pill to your daily routine. There are more live and a variety of cultures in the pill than in yogurt. I started taking a pro-biotic pill a few years ago. Whenever I slack off for a couple of weeks I feel the difference just in the general way I feel.
Many years ago I was having so many UTI infections that the doctor gave him a pyelogram to see if I had an ongoing infection in my kidneys. They were OK. Then the UTIs suddenly stopped as suddenly as they had begun repeating themselves. Perhaps our bodies are just better at protecting its self at some times then others?
You might ask your doctor about possible causes and treatments. It may be that using a different position or refraining from using a certain position might help.