How do I find the cause of EditForm.OnValidSubmit being called 4 times in rapid succession

[DavidThielen]

Hi all;

I have an issue where the EditForm.OnValidSubmit is called 4 times in rapid succession. One one user's computer. Sometimes. For every other user, works as expected. For this one user (using a Chromebook), about 20% of the time it calls OnValidSubmit 2 - 4 times. I have the full details here.

Q: My question is how do I go about debugging this to figure out why it is happening.

It only happens when this user hits the site running on Azure App Server so my debugging and/or logging must be on that environment. The good news is this happens regularly so easy to reproduce - on the one client computer.

thanks - dave