I have had an iPad Mini for about a year now. It is mainly used by my son at school. i also have an iPhone and an iPad Air which I had before the iPad mini. Since I set up my Apple ID about 5 years ago I have never changed the password. I have never had any issues with entering my Apple ID and Password on the iPhone or iPad Air. For the third time now on the iPad Mini I am having problems. It was initially on iOS 7 and now on iOS 8. It seems to lose the iMessage settings and when I go to turn them on again it won't accept my password. Repeatedly it tells me I have the incorrect password and then finally gives me a message telling me to reset my password. It will also do the same with iCloud. Previously I have fixed this by doing a full reset of the iPad. However, it is clear that this doesn't resolve the issue and what I really need to know is how to fix it. Does anyone have any ideas?