Ipod 6th gen keeps deleting calendar events
My new Ipod 6th Gen keeps deleting calendar events I'm creating, meaning I can't make any events in my calendar. It's happy to make an event, but it then immediately disappears for my calendar. I've tried changing the settings as to which calendars it displays, but it doesn't make a difference. I really need to use this function so I can keep track of my Lecture timetable, please help...
Additional info: it did freeze the other day in a black screen state that prevented me from charging it. After 40 minutes of trying to restart it, it eventually fixed and has been fine (other than the calendar revelation) ever since.
iPod touch, iOS 8.4.1