Ok, so I had a similar situation. What it was is that I signed up for insta pre Facebook merger. Then I connected my Facebook account to insta. So my old username password combo were compromised because I re used them when I was a moron when I was younger. So someone gained access via the original Instagram password and username, changes my email. Then I would login via Facebook and have access at the same time. The different geo locations and unusual activity caused my account to be locked periodically. When they unlocked it I logged in quick, changed the email address and password on the account on the Instagram side and enabled 2 factor and haven't had an issue since.
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Ok, so I had a similar situation. What it was is that I signed up for insta pre Facebook merger. Then I connected my Facebook account to insta. So my old username password combo were compromised because I re used them when I was a moron when I was younger. So someone gained access via the original Instagram password and username, changes my email. Then I would login via Facebook and have access at the same time. The different geo locations and unusual activity caused my account to be locked periodically. When they unlocked it I logged in quick, changed the email address and password on the account on the Instagram side and enabled 2 factor and haven't had an issue since.