How can I fix internal storage growing for no reason?
Before you can fix the issue you have to identify the cause. We have a few answers that deal with tracking down storage usage. But usually they target the external storage/SD-card. Here we are dealing with the internal storage, which is usually protected from normal user access and hence it's good (if not required) to have root. But other then that, the tools mentioned in the question should give you a good idea of how your internal storage is used:


Izzy's Answer on "Something is secretly eating up my Acer Iconia A500 internal memory and I need help finding it"
What can I do to manage my phone's internal storage?