Open Class from Planner doesn't always work

I've noticed that recently, trying to open a class from the Planner is rather hit or miss. I often have to leave the app and then reboot it (by removing it from memory) in order for the class to open when I tap and hold on a class in the planner.

Is there something I can do to fix this?

You are probably working with iOS10, let's hope Apple solves their issues in 10.2