iPad unavailable/15 minutes

[iwtfamtyp]

I bought a refurbished iPad a few months ago. I haven’t used it much because it was a spare. Today I went to power it on and it gave me the screen for if I’ve been attempting to unlock it unsuccessfully, unavailable try again in 15 minutes. I had not been trying to sign in, it was just sitting there, so I gave it 15 minutes. It still said exactly the same thing even though I hadn’t tried to sign in yet. I waited again, and it displayed the same message before I even attempted to try to sign in. I have owned iPads since the very first one was released, and I’ve never seen this issue. It’s almost as if it’s not incrementing time or if it was locked externally somehow. I know I could reset and erase it, but I’d rather find out what causes this, for future reference.