Device storage suddenly full. 5GB in one night of no use.

[amer369]

Hi, hope someone has the answer for this.
I have a note 4 and not factory reset it since purchased 15 months ago.
Normally I have about 5-6GB of free internal storage and my usage hasn't changed much since I got the phone.
Last night I had over 5GB storage, I know this because I used the file manager to search for a document and remember seeing how much free storage i had.
Woke up this morning to find a message on the screen saying storage almost full. Checked the storage and it said I had about 100mb left of free space on my device.
Used SD maid to search for unwanted files but it only found a few mb of files to delete.
Used a storage analysis tool to find any large unusual files but didn't find anything that wasn't there before.
Can't think of anything else apart from doing a factory reset. But dread that as I know android backup isn't as seamless as my previous iphone backup/restore process.

If anyone can has had this issue and know how to deal with it, id be grateful if you could share that with me.

Thanks

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[amer369]

Its with EE. I finally got to the bottom of it. Google play books was the culprit. For some reason it amassed 5GB of app data when I had about 70mb of pdfs uploaded onto it.
I cleared the app data and then uploaded the pdfs again and it's back to the way it was.
Sounds like another Google play bug..

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