iOS storage disappearing I've got an iPhone 5s 8gb with about 1.4gb of unused storage. 

Within the last week this storage goes down to zero multiple times a day just through normal use. When this happens iOS "cleans" all apps and frees up the storage back to 1.4gb. 

I've turned app background refresh off but still hasn't improved the situation. 

I suspect there's an app using storage without my knowing it. 

Is it possible to find the app causing the problem without restoring factory settings and reinstalling apps one at a time?
Plug your device into your computer. Download the app iFunbox. Go to the root file system, then open the directory "Application Archives" then delete all of the ipa files. 

Another alternative (without ads) is  iMazing  it does an amazing job with my files. (It's a paid app)