IPhone 6s constantly losing storage even when I'm doing nothing?

So I have a 16 gigabyte iPhone 6s, and ever since IOS 10, IIm constantly losing storage, even when IIm just doing nothing. I have been deleting and deleting apps and photos to get more storage, but the storage comes back for a little and then disappears. (Ex: I had Reddit on my phone, it took up 400 megabytes, I delete it, and I get 400 megabytes back, only to see in a few minutes I have 0 kilobytes of storage left.) this is so frustrating, I barely have any apps or photos, but it still says IIm using all my storage! All together all my apps and photos take up 2 gigabytes, and my update to iOS 10.2 only takes up 500 megabytes. How do I fix this? I can't take any photos or videos anymore, no matter how much I delete.

So I have a 16 gigabyte iPhone 6s, and ever since IOS 10, IIm constantly losing storage, even when IIm just doing nothing. I have been deleting and deleting apps and photos to get more storage, but the storage comes back for a little and then disappears. (Ex: I had Reddit on my phone, it took up 400 megabytes, I delete it, and I get 400 megabytes back, only to see in a few minutes I have 0 kilobytes of storage left.) this is so frustrating, I barely have any apps or photos, but it still says IIm using all my storage! All together all my apps and photos take up 2 gigabytes, and my update to iOS 10.2 only takes up 500 megabytes. How do I fix this? I can't take any photos or videos anymore, no matter how much I delete. This happened to my sister when she updated. She never really had any issues with storage before, and all of a sudden she keeps getting storage warnings even though she isn't downloading anything etc. I believe the issue with this is the software is mis calculating things (this commonly happens when a new iOS is installed on an iPhone that is very low on storage) Although I don't know a solution for this, I would suggest next iOS update you should install through your computer. Plug the phone into a computer with iTunes and then update it.