instagram keeps logging me out? what's wrong?

[Photography is my Life]

Yesterday I logged out of my instagram and each time i try to log back on, it immediately logs me out. This occurs on my iphone and on the web too.
My sister logged out of her account and logged back in and had no problems. I tried to log in using her ipod and I get the same problem again. So its not my device, but my instagram account!
Has anyone else experienced this problem? ahhh I can't take it any longer!

I know there was a power cut problem due to the storm couple of days ago, but after that my account was fine. So whats happened now?

Thanks a lot!