Can't log into Instagram on Iphone?

First, I was on instagram trying to post a photo but it kept "failing". I was unable to refresh, like photos, and view my profile. So I logged out now I can't get back in. It says I have no internet connection but I do. Any suggestions on what I should do or has this happened to any of you before?

I say you delete the app and install it again this happened to me and I did this and it worked. Hope you helped

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