Can't log into Spotify on iPad & iPhone 4S

[bellbottomblues]

I have two Spotify accounts, a regular one under my name, and a premium one that my dad got for me (that he registered under his name).

I've been using Spotify premium on both my iPad and iPhone for several months now, and it's worked perfectly, but about two or three days ago it just stopped. When I log in it pulls up my account and I can see my playlists, then it says "connecting..." and then it goes back to the log in screen and says "Could not login to Spotify. Maybe you've changed or mispelled the password?" I haven't changed any of the account details, but it will not let me log in. When I try to log in under the regular account it works fine. Why is this happening?