Force reload of a SPA page

I have a problem with a SPA child page. On this page I have a form that has a hidden field populated with a variable. This variable is a random 9 digit number. This all works very well. Except the page never gets reloaded to generate a new random number in the variable. I need this number to change each time the form is displayed.

I have tried adding the random number generation as a variable and as a default value for the form field. Even tried clearing the form on submit but the value never changes.

How can I either reset that variable on submit or force a reload of the child page with the form?