I am in the process of moving from an iPad Air to a Mini 2. I cannot get any icons to move to the dock. They just go back to where they were positioned. I have tried a restart and also a restart by holding the power and home button. I’ve never had an issue like this with the iPad Air or my iPhone, so it has me quite stymied. Software is up to date and storage says 10.4 of 16 GB used. Any ideas appreciated.