Why is my iphone so messed up?

So it restarted randomly the other day and deleted half of my camera roll and won't load the pictures back in bc they're in iCloud. Even though it's missing so much of its previous data it's telling me there's 0 bytes of space left. Even though when I add up all the bytes used it adds up to around 5 gb meaning there should be 6 gb of storage left. My apps keep crashing and things load super slow and some not at all. I'm also not getting any messages through iMessage. I have no idea why this is happening it makes no sense. Is my phone just done for? I've only had this one for a year.

Try to factory reset your iPhone and then restore it with an backup.

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