Blank White Page once a day

Every day I get a Blank White page with the following:

It happens once (sometimes in the am, sometimes in the pm)
It happens ONLY on my booking page (bookingcleaning, bookcleaningstep2, bookcleaningstep3, bookcleaningcheckout) (using woocommerce plugin for these pages)
All other pages are fine.
I can access the admin panel with no issues.
The way I fix it (I think!) is by sometimes logging on to the admin panel..and this fixes the page
If that does not work, then I launch the page in Firefox (for some reason there are no issues in firefox) and perform a sample booking.

I did look at the function.php file for any blank white space.

Can anyone please help? Why this happens only to the booking page and why it happens randomly.

Thank you very much in advance