Squawk7700, you talk about the iPad failing but have evidently flown with your GNS 430 not having a functioning Fan which threatens to render it useless as well, essentially an item that makes it TSO'd has failed yet you continued on with without actually knowing what would happen? Did you have a backup? I'm sure you did!
Just like any piece of Equipment, it's all fun and games till it fails, if you use an iPad keep a backup just incase, it's prudent planning just like ANYTHING. You don't go out IFR relying on a single instrument working, you have backups. EFBs just like any other piece of equipment require some extra thought and planning to use safely and effectively.