Users getting kicked off Smartsheet


Hello, I created a Smartsheet that tracks a form completion. The problem is that some users (different users on different computers and on different days) are getting kicked out of the Form before they finish. Is there a reason for this? What could it be? Since it's intermittent and not everyone, I really don't know what it could be? I don't even know where to begin looking after the Form and Sheet settings. Thank you!