ilife Media Browser eats up disk space - how can it be stopped?

I've been plagued by hard drive space disappearing. 30 GB can disappear in an hour. If I don't catch it time, I can't save any open work and can't even empty the trash. I've lost lost of work this way. When I restart the space all comes back.

I've identified the culprit:

Library/Containers/com.apple.MediaLibraryService/Data/Library/Caches/com.apple.iLifeMediaBrowser.ILPhotosTranscodeCache

This fills with thousands of files -- photos and videos. I can throw all these files in the trash and empty and that gets my space back without requiring a restart, but as said if I don't catch it in time I can lose work. And then in a day or two it starts filling up again.

I'd like this to stop. I have no app called iLife Media Browser. From what I've been able to find, this may be part of Garage Band, which I rarely ever use, and if I did I would not use photos and videos in Garage Band (?!)

Does anyone have any ideas of how I can fix this? Thanks!