planner and schedule

I'm typing in my lesson plans in the planner and pressing done once finished, but I'm finding that my plans disappear and I have to type them again. Is there a bug or am I do something wrong? This doesn't always happen but has happened three times or so in the last week. Having to press select all and copy before pressing done just in case it happens again.

It shouldn't happen at all. Are you maybe switching apps while you type those plans?
If you can provide any additional details we'll look into it