Just jumping in here to add some extra info to the good troubleshooting @robigouk suggested.
When you perform the reinstall, make sure to follow these steps. They are more thorough and ensure that no corrupted files remain, if there are any. Make sure to also restart your phone, this is a simple, but often overlooked step.
You should also head over to your account page and revoke the access of any third party apps, that you don' recognize. It's possible that one of them is causing this behavior. You can learn how to do this here.
Hope this helps. Keep us posted on how it goes.
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