I have a cloud version of Jira and the gadgets that are going undefined are native available gadgets. You can see in the Screen shot the 3 I have highlighted are the ones that will randomly come back as undefined. The Velocity gadget is the one add on gadget and it does not have this problem.
When this happens I delete the undefined gadget from my instance and re add it and it works fine for several days and then goes undefined again.
What is going on and how do I permanently fix this?